I followed Dominique's e-mail about the next MSLUG meeting to the MSLUG home page and clicked on some "Companies known to use Lisp/ Scheme". It seems that the SGDL and Logik3d pages are no more, although there are
http:/www.sgdl.com/
(permanently under construction) and
I found the SGDL paper from the Scheme 2000 workshop (was it really so long ago?), and I still find it interesting. And the current version of Gambit, with inline fixnum arithmetic jumping to the bignum routines when necessary, would be a much better platform for such a system.
It appears that Dominique wrote a lot of code for the SGDL system, at least from some messages that went back and forth on the PLT mail list. Is there anyone still trying to do stuff like this in Scheme and/or Lisp (and don't tell me AutoCAD!).
Brad