I don't do a lot of curcuit wiring for crossovers since I use electronic crossovers, but.....While its not as classy, you can actually put the parts on a big piece of plywood or peg board, and solder them together exactly as it looks on the paper diagram. You can glue the parts on the board with hot glue. Don't worry about using too much wire; that's pretty hard to do unless your wiring thing is on a 15 foot x 15 foot board.
Hope this helps.