I get 1/2 an 18 X 20 2 car garage (modern 2 car- no way 2 60/70 era cars would fit). So about 200 sq ft. Peg board above an 8' long bench on 1 wall, (under 2' of "stuff").
Some cabinets on back wall, planes hanging from ceiling on racks, and stacked up on almost every horizontal surface, a rolling bench and various stands / tools boxes, etc seperate my 1/2 from the rest of " that junk" - you know mowers, edgers, other stuff that keeps a house from falling in on itself.
oh yeah - And a building board with a framed up Twister wing under the Futon in the spare bedroom, and a 1/2A plane on a desk in the "office", boxes of engines in a closet to get them out of the humidity, and a plane or 2 + pit stuff in Portland, Phoenix, Albuquerque, - so I guess I am using a bit of space at 2 or 3 other peoples house!