Is this too big, or size matters.

Basic Question: Has anyone built the Campster 12, or similar, on a HF 4x8?
I have access to tubular aluminum(free) to extend the front, back and sides. I'm just worried that it may be too much for the trailer, especially the width.
TV is not a problem. We have a Chevy Express 3500 15-passenger.
I am basically cheap, and poor, and want to keep this whole project on as tight a budget as possible. We will probably get it campable by this spring and then refine/improve with time.
I have access to tubular aluminum(free) to extend the front, back and sides. I'm just worried that it may be too much for the trailer, especially the width.
TV is not a problem. We have a Chevy Express 3500 15-passenger.
I am basically cheap, and poor, and want to keep this whole project on as tight a budget as possible. We will probably get it campable by this spring and then refine/improve with time.