I would allow about 1,000 square feet for the bedroom (10' X 12') bathroom (5' X 7' minimum), garage (20' X 36' - 3 cars) and circulation. That leaves a lot of space for pins. As a planning number, I would assume a double loaded pin "module" of about 45 square feet (15 feet X 3 feet) for two pins facing each other. If the building proportions were something like 60 X 105 feet, you could get four modules along the 60 foot wall, and in the 5300 square feet remaining after the bedroom/garage etc. get over 200 pins easy.

Yeah, I agree, just answering the OP's question - how many machines can 4-5K accommodate. If I had the space, I would definitely consider the spaces you mention, plus plenty of room still left over for a full bowler, shuffleboard, skee ball, etc., theater, kitchenette, etc. Its a lot of space.