Wow Alex. That looks like a lot of work. Looks like the hard part is done (the welding and sanding) Good luck with the rest of the project.
I'm not going to try to make a 993. This will be a race car with bolted on panels with struts and braces where needed. It'll look like a 993, but it won't fool anyone.
Here's one that was built using an early chassis:
And one that just screams at me...(from Cory's RL thread)