Originally Posted by Howlermonkey

Whatever you do, don't start with a z31 turbo crossmember.

It has the driver side mount pad skewed way forward of the passenger side.

The N/A crossmember is a better starting point and you will definately have to move the tranny back since the vg30 bellhousing protrudes into the engine compartment much more than in an inline configuration..................but you wouldn't be using the z31 tranny anyway so fabrication is in order in light of NLA parts.