Hi Matt,
Here are a couple of links that might be helpful. Thefirst is the Classic Motorsports project car. Looks like they didn't have to do much bodywork on it. The second is the Japanese car branch of Victoria British. I wouldn't use their stuff for a concours restoration, but they'd be OK for a regular driver. I've bought MG parts from them for years. There are also a couple of other Z-car specialists who advertize in Classic Motorsports that might be helpful.
Ben
http://classicmotorsports.net/project-cars/1970-datsun-240z/
http://www.blackdragonauto.com/