Doug - thanks for posting. It's always interesting to hear different ways of doing things to spark ideas. My money says you have some older buoyancy billets by the sounds of how easy it is to dent. I too have some of the older stuff and I only use it for other things (base for holding and molding heads upon, carving rocks, etc.) because it IS too soft IMO for fish bodies. The more recent BB is much nicer and perfectly dense IMO. That being said, I too add support - 1/8" - 1/4" wooden dowels actually to the throat latch and into the head portion of the foam to add support and to keep from breaking the foam while fitting up on smaller fish. Toothpicks go into the tail portion. Never cracked a form after doing these quick, extra steps. The newer BB holds staples pretty well. They may pop up a very small amount (never out) after drying and you simply tap them back down with a hammer before finishing your seam. I personally don't see much of a purpose for taking the time to create a board for the inside. I've never had any issues - not even with the softer BB. IMO it holds wooden dowels just fine (that I hot glue in for permanency). It's that older floral foam crap that you have to worry about degrading and coming loose and this is where I'll add a board inside. Just the way I do it!