Great idea, and awesome work on the custom acrylic display. Could apply this to so many possibilities. Voted! :)
Always great when you need to read the 'ible, since the material is re-worked to a point where the origin is not recognizable :)
Leather Glamp ChairView Instructable »
Fire Piston (Made From Aluminium)
How to make Pressed Penny Wind Chimes (+ Sound file)
I should make it clear that this is not the kind of trap you would just drop and leave, rather you should check it every so often depending on the location (every ~5-15 minutes). Crabs will literally stack on top of each other for the bait, so depending on how much extra netting you have, one pull could hold 10+ 7" crabs easily. The other factor would be the strength of the netting.. the rim strength at that angle is very high, so with strong netting, I'm sure you could pull 40lbs or more.. the netting or cord breaking before the frame.