Snoopy1
640cc Uber Pimp
Let me take another picture and sketch up what I am thinking and see what you think. ThanksI'd put a 1/4-1/2" bump in the aft air exit. You could just cover a little piece of ply and glue it to the front former there. Maybe some tri-stock if you want to get fancy.
I'd be happy to draft something in CAD for you, shipping and item to Canada might be tricky.