Ready, Steady, Fire!
Maybe not the best item for apartment dwellers this Trebuchet-style catapault can launch a golf ball more than 200 feet!   The detailed instructions (14 pages!) are complete with diagrams, photos, tuning tips, equations for calculating the machine's efficiency and more!   All parts are pre-cut, pre-drilled and can be assembled to a finished model in one evening (plus glue drying time).

this model is only 34 inches tall, 18 inches long and 7 inches wide (12 inches wide including the steel boxes)