Anything can be done, but that would take major modification.
16 huh, here I am at 16 in 1974. Listen, I have loved body mods as well as these photos prove. In fact, this truck is in my back yard as we speak. It has lived as a chopped flat bed with an inline six with a homemade tunnel ram with a four barrel 14 inches higher than the valve cover. It has lived with regular step side bed and a mid engine Buick 401 with the carb right between the bucket seats!! It is now sectioned 2.5 inches along with the chop with a 440 CID Buick nailhead up front where it belongs. I LOVE body mods, but that doesn't mean you do something stupid just to be different, like the mid engine thing. That was just stupid it was a freak show and got attention, but it was stupid.
My point was that to take a $8,000.00 five window coupe body and cut the back off to make an "extended cab" phantom makes no sense. If you did want this extended cab, you would take a $1,000.00 pick up cab (my brother just recently sold three of them for $500.00 to $1,200.00) and make it. The outcome would be basically the same.
Like I said, EVERTHING that could possibly be done has been, at least to a 32 Ford. You are sixteen, if you looked at a different rod magazine every day for three or four years you wouldn't have looked at as many as I have since I was your age. Believe me, 32 Fords are the most modified, hot rodded car EVER.
Sooooo, does that mean you couldn't do SOMETHING different, sure you could. If you are interested in this hobby, you will, I know that. In fact, you wouldn't have asked the question if you weren't on your way to being a car builder. My original point is you don't HAVE to do something "different" to be a stand out, not by a long shot.
The cars that will stop me in my tracks at a show invariably have lots of DETAIL, and few big mods. I can remember right now as I type this a couple of cars that did this. These cars begged you to examine every single square inch trying to understand what was done. They were full of tiny details like a body lines that where "softened". Or like on a 65 Mustang I saw once, the rear bumper was fitted flush to the body where they made the gaps from body to bumper only a quarter inch or so instead of the half inch from the factory. The body just flowed from quarter to bumper, with the bumper still chrome, it was very striking. The entire car was full of detail like that.
I am not knocking you, believe me. I am explaining my point of view, take it, use it or toss it, that is up to you. One day you could cut some car up and build a wild new style, that is very possible. Just do a lot of thinking and planning first, and don't do stupid just to be different.