Thanks for the welcome. Looks like a lot of cool projects...not sure why I never came across your site before??
You are correct, the wheel base is a little different and the body is wider. I widened the quarters and front fenders then split the inner door and widened them. The doors are stock '70 length but are taller than stock. I can post specific pictures of them latter today or you could see the entire project on Mustangs to Fear Forum page.
I'm building this car because I prefer the old school look but like the modern conveniences that come with the 09 (drive train, suspension, brakes, lighting, A/C, etc). I love the challenges that go with it and am doing it for fun. After completing the body, I decided not to go with the stock 09 dash and wanted to build the interior from scratch except I'm using a headliner from Mustangs to Fear. My dash is basically done and now I'm working on the rear seat area. My plan will be to wrap a lot of it with leather. I've included a couple more recent pictures of it.