So I recently ordered and received my brand new sheet metal all the way around and wood. My question is this, when following the instructions after the front panel and sides are connected you attatch the rear cross sill and measure to make sure the bed is square. When aligning the side and rear sill in order to make the bed square and measure 48 1/2 across it take the side out of alignment with the predrilled holes on the bed side. Should I expect to have to drill holes or am I doing something wrong.