Brandon answered most of your questions............ I think an optical comparator would be the easiest piece of pseudo percision measuring equipment to find. If you can't find one, you can make one by laying out a measured grid on a piece of butcher paper, hanging it level on a wall, then placing the part a precisely know distance from the wall, and finally putting a light source behind it.
Once you get that done, you should be able to measure angles and disctances wit ha reasonable degree of accuracy (for what you are trying to do). :geek: