Y'all may want to look into building with XPF foam and fiberglass Check out the trailer site http://www.tnttt.com/viewforum.php?f=55 this is the "foamie" forum They tend to keep $ a priority & light weight, they also use what they call PMF "poor mans fiberglass" I can't make this message long enough cause of character limits, but I have other thoughts...
Good Luck... Curt
Good Luck... Curt