Hi DMSS1. I don't have time for a thorough discussion here but some quick thoughts / points ...
1. I didn't say it was impossible. Please go back and read what I said.
2. You're singing to the choir when it comes to "what can be done with LISP". You'd be hard pressed to find a bigger LISP advocate, but ...
3. Have you fully considered the impacts of a 100% LISP solution? Performance? Security? Upgrade-ability?
4. The application, if using 100% LISP will no doubt have to exploit many ActiveX based LISP functions. Have you explored what the performance / reliability / availability is for said functions under newer versions of AutoCAD, like 2010+?
5. This application will be GUI intensive, are you going to use DCL? OpenDCL? ObjectDCL? DLL based dialogs? What are the impacts of using the chosen platform with regards to expressiveness, performance, security ad infinitum?
6. As stated previously I think the 8 month time frame is ambitious for the lofty plans for the application. Have you factored in all facets of a typical development cycle, including testing, documentation?
7. Have you considered model size issues / limits? Co-existence issues?
8. Have you explored the various way the 3D objects can be modeled, e.g. meshes, faces, solids etc. and impacts to file sizes, dwg integrity / fragility, modify-ability etc?
9. Have you explored the myriad of ways the data will be stored, xdata, dictionaries, xdictionaries, external databases yada?
10. A demo, which can illuminate some of the above would be useful / intersting, and sounds like a very good idea.
11. I may sound like a foe but I'm not. I'm trying to share my expertise and experience, which spans many decades, multiple engineering disciplines and includes parametric modeling.
12. If it emerges that I wish to be involved, either directly or in some advisory capacity, I can provide a private and secure project workspace.
PS: Why will people want to invest their time in effort on your project? What is your expertise? What is your experience? What is your real name? Etc.
Sincerely,
Michael.