Wouldn't surprise me one bit, although it is a ton of work obviously. Hell check out what the 3rd gen guys are doing.

http://www.longbedmegacab.com/

That makes for a long truck lol, but they never offered a long bed mega cab so theres the solution. When we have local meets there is a guy that had this done (although im not sure if he went though the company I linked above.) Even slapped a pro charger on (you can see the intercooler in the pic ) What got me interested was when he was telling the story about how he took it in for alignment and the tech couldn't figure out why it wouldn't fit on the alignment rack hahaha.



But back to the topic, I too would like to have the true four door in my 2nd gen. :/

 

im going to do some research and contact a local custom shop just to see what it would cost just for ****s and giggles. i will see what i can come up with