Found these pictures of the Vildini 'cradle' install.
http://www.vildinimotorsport.com/gallery/Justin%20-%20SR240z/7.jpg
http://www.vildinimotorsport.com/gallery/Justin%20-%20SR240z/8.JPG
Compared to the install with the stock mount locations, it looks like that Vildini is using the SR20 mount points.
Any idea how much the weight distribution is shifted to the rear with a SR swap? The engine sits almost completely behind the strut towers, which could qualify it as mid-engined, eg 350Z "front mid".
Good luck with the project! At least you have one