I’ve decided to go with ReplicatorG which is primarily made for 3D printing but I’ll be adding a new driver for the Zen Toolworks 7×7 (serial passthrough with geometry to match cutting platform) and creating a Skeinforge profile (for cutting not extrusion) too.
I’m just reading docs etc at the moment and should have xml for both ready before the weekend.
Creating a simple object in Google Sketchup (exporting to stl) and opening in ReplicatorG is simple enough task. Only problem is that the toolpath visualisation has been disabled for R25.
Hopefully I won’t need anything else besides Sketchup and ReplicatorG (skeinforge).