is there any advantage of a semi solid over a solid mold? i may be silly, but the semi solid molds look like they would take a bit more time to make.. considering you gota make sure everything is lined up and in square, and then (nail or glue?) all the little braces in. Whereas a solid mold, you take a bunch of mdf, glue and screw it together, cut out and shape your shape, and your done. So before i jump in and make one or the other, which one will be better in the long run? I have a large pile of 1/2 thick MDF, so materials is not an issue.