Well, I got out the EZ-UP and started assembling the frame today. I'm to the part where I have to spline the front and rear together using the center two crossmembers.
Read a post on another thread where somebody is extending the chassis to 9' using the crossmembers this way. I'm seriously thinking about that, when the wife and I measured off a 4x8 space in the LR floor and tried it for size. The verdict is: too narrow! We are not small people, and to think of getting in and out, rolling over, etc., we will need a 5' width.
So all of a sudden, I'm thinking of making this project much more complicated by changing the dimensions. Now I have to measure for the axle location closer to the rear, and work out a plan for floor framing. I'm hoping to clear the fenders, or at least come out flush with the top of them, so I don't have to build a huge fender well inside.
Also, made a drawing of a 5x9 floor plan. Looks like the drawers I salvaged from an old steel sink will need about 2' of cabinet to slide back into. This will give me 6" of floor space right on the tailgate for lawnchairs, groceries, etc., as well as about 6.5' for the cabin.
Gregg