They can be time consuming to make but it really is all in the method. Besides these I have made 4 other sets for people (one of these was the winning set in Montreal) and have a pretty good method. Expect to spend 3-5 hours on the first one and 2-4 on the second. Worth the time spent as you will get many races/uses out of them. Nothing like hitting the Nathan Phillips rink in the middle of the night and buzzing the hockey players. This is prolly pretty obvious but NEVER ride em on pavement.