It works!!! Yippe!
I installed WINE (32-bit) under my CENTOS 5.3 (64-bit) OS today, and then installed my newly acquired copy of AutoCAD 2000 (took some registry editing to get it to report as WinNT4SP3). Running on a 2.6GHz Core i7 with 12GB RAM it runs SO much better (though the commands are taking some getting used to). It was able to render the whole model in (relatively) short time - and without a Heap Stack overflow!
So, here is the work as it exists to date: