I think that will be too long. The Regular Cab roof is only about 30" or so long. You would probably have a good bit of overhang on the front and/or back of the roof and it would look odd. I built mine 30"x48". You might want to measure to be sure.

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2002 Blue Edge <-- Retired off road toy
3.0 Automatic, 2wd, 4:56's, 35x12.5 Kuhmo's, Lifted 2x, and more. TOTM July 2015
2002 Jeep TJ <-- NEW off road toy!
2.5L 5-spd, Skyjacker 4.5", 4:56's, Aussie Lockers, 33x12.5's, and more.
Build Thread --> http://www.fordrangerforum.com/proje...blue-edge.html
Youtube --> https://www.youtube.com/user/smashlizard