The stand off's just sit on the form, I have 1 inch steel angle bolted to the sides and that gives a 1/8 lip on top which the stand offs sit down inside. I can slide the mid limb posts I call them, either way. The closer to the riser the more deflex, the more towards the tips the less deflex and more reflex. I normally just place them at mid limb or an inch or two either way from mid limb. I use three big clamps, one at the center post and one at each mid limb posts, those clamps clamp to the bottom side of the form. Yes I wanted to build a bow shop so I did:) I used to do all my bow work in the basement and that put Osage dust all through the house, but my wife never complained..
You want to see a funny video look at Frog Dog, it's over 4 minutes long but he catches a frog in the pond. On the second page there.
