you are correct, when I made my jacket, the back is like 1-1.5" WIDER then the front......i only found out after getting all the sheet metal done. but still made it fit.
Is there some special formula for calculating the angle of the bi-astitutunous when determining the rectilinear output of this unique weldment? R U sure it was planned or just of a result drunken welding adventure on a slow Friday afternoon?