diff --git a/src/proc/engine/nodefactory.cpp b/src/proc/engine/nodefactory.cpp
index 9d5169d92..628e247e2 100644
--- a/src/proc/engine/nodefactory.cpp
+++ b/src/proc/engine/nodefactory.cpp
@@ -24,12 +24,58 @@
 #include "proc/engine/nodefactory.hpp"
 #include "proc/mobject/session/effect.hpp"
 
-namespace engine {
+#include "proc/engine/nodewiring.hpp"
 
+namespace engine {
+  
+  namespace { // Details of node fabrication
+
+    class Alloc {}; ///////////////TODO
+    
+    template<class NODE>
+    NODE &
+    makeNode ()
+    {
+      ////TODO: this is a draft how it /might/ work
+      ////TODO: of course this can't be hard wired....
+      
+      ProcNode * predecessor1, predecessor2;
+      
+      WiringInstaller setup;
+      setup.defineInput (4, predecessor1, 2);
+      setup.defineInput (2, predecessor2);
+      
+      WiringFactory* wFac;
+      
+      Alloc allocator;
+      bool doCache = (2 == 2); // find out Cache should be used for this node
+      
+      WiringDescriptor & wDesc = (*wFac)(setup,doCache);
+      
+      NODE *newNode = new(allocator()) NODE (wDesc);   // actually this line needs to be atomic
+      
+      return *newNode;
+      
+      /*
+       * Problems to be solved:
+       * - write a generic allocator, which later on can be augmented to do block wise bulk allocation
+       * - the allocator needs to keep track of the objects; actually he owns the objects
+       * - we need to access the wiring descriptor of the predecessor nodes. Which means, the code
+       *   must be in the body of NodeFactory (because the latter is friend of ProcNode and can access the wiring descriptor)
+       * - btw reconsider if this level of protection is necessary, or if the const WiringDescriptor cant be just on the public interface of ProcNode
+       * - find out how the Caching/ReadInput/InPlace detection can work
+       * - think about a sensible Ctor for NodeFactory. This one must create the WiringFactory and pass the Allocator.
+       * - all of this will be installed into the ToolFactory, i.e. it is part of the build process
+       */
+    }
+    
+  } // (END) Details of node fabrication
+  
+  
   using mobject::Placement;
   using mobject::session::Effect;
   
-
+  
   /** create a processing node able to render an effect */
   PTrafo
   NodeFactory::operator() (Placement<Effect> const&)
diff --git a/src/proc/engine/nodewiring.cpp b/src/proc/engine/nodewiring.cpp
index 864905a22..ccb0824a3 100644
--- a/src/proc/engine/nodewiring.cpp
+++ b/src/proc/engine/nodewiring.cpp
@@ -119,7 +119,7 @@ namespace engine {
    *  the new processing node to be wired up.  
    */
   WiringDescriptor&
-  WiringFactory::operator() (uint nrOut, uint nrIn, bool cache)
+  WiringFactory::operator() (WiringInstaller& setup, bool cache)
   {
     UNIMPLEMENTED ("build the actual wiring descriptor based on given operation options");
     
diff --git a/src/proc/engine/nodewiring.hpp b/src/proc/engine/nodewiring.hpp
index 661cb7c46..c906e7329 100644
--- a/src/proc/engine/nodewiring.hpp
+++ b/src/proc/engine/nodewiring.hpp
@@ -27,6 +27,7 @@
 
 #include "proc/engine/procnode.hpp"
 
+#include <boost/noncopyable.hpp>
 #include <boost/scoped_ptr.hpp>
 #include <cstddef>
 
@@ -39,6 +40,28 @@ namespace engine {
   
   namespace config { class WiringFactoryImpl; }
   
+  using lib::RefArray;
+  
+  
+  /**
+   * Finding out about a concrete way of wiring up a
+   * ProcNode about to be built. Such a (temporary) setup object
+   * is used while building the low-level model. It is loaded with
+   * information concerning the intended connections to be made
+   * and then used to initialise the wiring descriptor, which
+   * in turn allows us to setup the ProcNode.  
+   */
+  class WiringInstaller : boost::noncopyable
+    {
+    public:
+      RefArray<ChannelDescriptor>& makeOutDescriptor() ;
+      RefArray<InChanDescriptor>&  makeInDescriptor() ;
+      WiringDescriptor::ProcFunc*  resolveProcessingFunction() ;
+      lumiera::NodeID const&       createNodeID() ;
+    };
+  
+  
+  
   
   /**
    * Actual implementation of the link between nodes,
@@ -54,6 +77,16 @@ namespace engine {
     : public WiringDescriptor
     {
       
+      NodeWiring(WiringInstaller& setup)
+        : WiringDescriptor(setup.makeOutDescriptor(), 
+                           setup.makeInDescriptor(),
+                           setup.resolveProcessingFunction(),
+                           setup.createNodeID())
+        {
+          nrO = out.size();
+          nrI = in.size();
+        }
+      
       friend class WiringFactory;
       
       
@@ -65,10 +98,6 @@ namespace engine {
           return thisStep.retrieve (); // fetch or calculate results
         }
       
-      
-      //////
-      //////TODO: push "almost everything" up into an ABC
-      //////////  and create an ctor to set up the RefArrays
     };
 
     
@@ -79,7 +108,7 @@ namespace engine {
       
     public:
       WiringDescriptor&
-      operator() (uint nrOut, uint nrIn, bool cache);
+      operator() (WiringInstaller& setup, bool cache);
     };
   
   
diff --git a/src/proc/engine/procnode.hpp b/src/proc/engine/procnode.hpp
index 0b4d218d0..05bfaf8e9 100644
--- a/src/proc/engine/procnode.hpp
+++ b/src/proc/engine/procnode.hpp
@@ -46,6 +46,7 @@
 #include "proc/state.hpp"
 #include "proc/mobject/parameter.hpp"
 #include "common/frameid.hpp"
+#include "lib/refarray.hpp"
 
 #include <vector>
 
@@ -58,8 +59,6 @@ namespace engine {
   using lumiera::NodeID;
   
   class ProcNode;
-  class NodeFactory;
-  
   typedef ProcNode* PNode;
   
   
@@ -70,11 +69,11 @@ namespace engine {
   class WiringDescriptor
     {
     public:
-      uint nrI;
       uint nrO;
+      uint nrI;
       
-      ChannelDescriptor  out[];
-      InChanDescriptor   in[];
+      lib::RefArray<ChannelDescriptor>& out;
+      lib::RefArray<InChanDescriptor>&  in;
       
       typedef void (ProcFunc) (BuffHandle::PBuff);
       
@@ -85,8 +84,8 @@ namespace engine {
       virtual ~WiringDescriptor() {}
       
     protected:
-      WiringDescriptor (ChannelDescriptor* o, 
-                        InChanDescriptor* i,
+      WiringDescriptor (lib::RefArray<ChannelDescriptor>& o, 
+                        lib::RefArray<InChanDescriptor>& i,
                         ProcFunc pFunc, NodeID const& nID)
         : out(o), in(i),
           procFunction(pFunc),