Welcome to the forum trainlover. I haven't actually built a vac-u-tug but know several that have and they love them. They are a quick and simple build to get you on the water fast. The amount of detail is up to you, simple or elaborate. Go here
http://www.rcgroups.com/forums/forumdisplay.php?f=55 and under search this forum, type in vac-u-tug. There are several threads on the vac-u-tug.