I would not build a 4x8 but build one larger. Go to a dealer and look at a 4'x8'. The 4' width is to narrow with office style swivel chairs and shelving. I would build a 5'x8' or 6'x9' if there are more than 3 of you. I built 4'x6' and with two chairs it is very tight for two people. It is tight with me and my camera/tripod set up. It was to tight when I had 2 adults and one child. If I had it to do over I would go 5'x7' for just two people.