Personally, i feel that the gimmick was quite easy to make. If you are profficient with making creative cardboard artwork, or just christmas cards style decorations i think you can pull it off. It will take you aobut half an hour to make you first gimmick, and it will be sort of a test. (you would understand why once you buy the trick).
The angles depend on how you perform. if you go for the whole tabled situation, then the angles can be quite good, unless someone is looking over your shoulder, the angles would be sort of like in a pass. This is the begging. The actual restoration is virtually angle proof, but you dont want anyone standing over 45 degrees to your left or right.