Over the course of the next few weekends I'm going to start replacing 2 dry rotted 'sideboards' on the roof. I've looked around on the site and have a general idea of what is involved, but I'd love to ask a quick question to someone who has handled one similar. #1 Is the roof all one piece? I.e. Does the aluminum on the 'roof' continue down onto the 'sideboards' or is each piece separate? I'd love to know this prior to tearing into it. My initial plan (If the pieces are separate) is to remove the front and side 'sideboard', and replace with 3/4" ply that has been sealed with Thompsons. The front board should be quick and easy. The 'side' one should be a little more fun. I'll need to take 2 pieces of plywood (Due to length) and attach the butt ends together to make the total length. What is the best method of attaching these together? Everything will be reattached and clamped back down. New weather stripping added, and the roof re-caulked / sealed. Is there anything else I should know up front or anything I'm missing? Any comments or advice? Thanks!