nop gotta do a bondo setup. if I leave open spaces in there the vacuum former will crush it. I found that out the hard way. 20 hours of work on a fiberglass mat, 2 layers of cloth and foam setup took about 3 seconds to crush. But truth be told I had a lot of open space in there too! If I was to do it on a home built setup it would have been ok, but since I wanted it done fast I took it to a vacuformer who still will do small runs of 15-30 sets , I'm looking into building a vacuformer so that I can test out stuff I need to make for the dart. I want a nice one so it'll cost a few buck to build.