small window to big window?

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im new to this site and im usually on the 47-59 board as i currently have a 55 project . but i used to have a 66 big window step side that got ripped off in 1993 and ive always wanted another (fleetside this time) my question is most of the trucks ive been looking at are small windows . has anyone here ever converted a small to a big? it looks pretty simple since the outline for the big window is already there

thanks in advance for any input

brian