Replacing Panels on inside rounded corners?

[Carla G]

I recently bought a 28 foot bigfoot and need to do something with the roof. Right now it is material and it's starting to sag. My hubby and I were thinking maybe we could re-sheet it with paneling, but he's concerned about the rounded corners.
Does anyone have any advice on this?
Should we just by a new roll of material and redo it?

[Reid Larsen]

I think the first thing I would do is try and restick the existing material. It would be very difficult to fit a rigid panel into a round inside corner. If the existing material is available and what is there now is really in bad shape by all means replace it. my two cents worth