Hi Michael...

As long as I know, some autocad clone use LGS, also some CAM vendor.
Regarding cost, looks like they can provide reasonable cost both for developer and end user.
I think you should discuss further with LGS people. We believe you can develop far more robust and good history and or constraint solver, but here you are one man show. So we hope LGS can speed up development of MoI3D.

Thanks...