What I did was glue a piece on the back,and then drew outline shape of original,for fit and fill.Then I traced the final shape which is from a 65 chevelle rear quarter.Cut that out and BAM!Then glue some strips to get the ledge.Thanks guys!Love it or hate it I still thank y'all for comments.Don't be shy cause when it's finished my drummer and best friend will tear it apart with his idea of how I should have built it.He will only look at my finished work