Thanks for the support! As far as i can tell, except outer body everything is identical to 356. I have a new top and drop in side curtain from vintage speedsters, in burgandy. Floor speedster floor mats worked great too. The engine bay is much longer, about a foot atleast. Compartment ends right at the end of the exaust tips. So easy for the subaru or 911 engines. It is 4 inch square tube chassis mounted to vw pan so quite strong and heat flows through that. Plenty of room behind the grill fo a good size bolt in radiator or airconditioning to be put in. The 356 speedster car covers work really well and tight. I did take out the single port 1300 and installed a new 2180 i had laying around for the sterlings to get 3x the HP.
Except that the 359 track and wheelbase are like that of the real 959. The wheelbase is 89.5 inches long which is exactly the same as the original 959.