Hi Michael,

you're absolutely right.
Defining and supporting an API
is very time-consuming.
But I think it's not a bad idea to prepare the
structure of the software to be able to implement
an API in a later version.

By the way, if I can help you in any way,
testing for example, let me know.
As I mentioned I'm familiar with a lot of cad systems
AutoCAD, MDT, Inventor, Nemetschek Allplan (Architecture),
RoboCAD, Spirit (Architecture), Truespace, TDI, Alias Wavefront,...

best regards
- Ralf