There's one little problem with going to 64 bit for him. He's using a version of Autocad that was designed for Win3.1 and Win95.
There's Win XP mode and the compatibility settings to help out with that.
This ground-up Enterprise is amazing...it's how I always picture doing the ship, and it'd definitely be awesome to do a walk through with some 3d game engine of this ship some day.
I'm stuck using 32-bit WINE under 64-bit CENTOS, so I sill have the 4GB limit, but I probably got away from the XP-imposed 2GB limit (we'll see in time). The other 8GB of RAM allow me to do other things with the system simultaneously (such as running Blender to do high-res renders. Say... do I have time to do that tonight?)
For the 3d walk-through, I am planning on using Blender. Now, if I can just figure out how to use it....