I use that type of form exclusively. cheaper to make and in my opinon a better form. I use 3/8 dowels and they are an inch and a half longer on each side of the form. I drill my holes slightly smaller and drive the dowels in, I don't glue them. I space my dowels 2" apart. For the rubber Go to a tire shop, get an old tractor inter tube or the largest inter tube they have, Usually they will give them away. Spiral cut it into a strip about 1 1/4 wide and a mile long. I cut 85 feet out of half a tube. I criscross and double wrap and get perfect glue lines on glass bows. I clamp the riser area and the fades with clamps
James.......................