Doing a full size mechanical drawing of the bike is one of the things I find most fun in the building process. Of course I grew up in the era of eraser bags, so it's a process I'm more comfortable with. One does need to fashion some "tools" like a compass large enough for wheels. Suitable paper is another issue. I buy large poster board from the Dollar Store for 50 cents each, but it does require that you tape two together for a full frame drawing.