Yep, i'm in the process of building the Nissan 300zx sisters.
Was planning on making the z31 anyway, but this thread gave me a reason to actually start.
Difference between the two will be the skin, placement of nodes, engine etc. (same file with a few tweaks basically)
And to feature in both cars, possibly the 1st time ever: realistic semi trailing arms for the rear (havn't seen this done, yet) and macpherson struts on the front (mabye, if i can figure out a decent way to do it)
And, (well, for the z31 anyway) somewhat of an interior.
If anyone has done either of the above, link me.
Current progress: Plotting out floorpan nodes and beaming together.