If the local pick-your-part yard is nearby and having sale or has decent pricing, I'd look for a cancer-free bed and do a meticulous job rustproofing it with Fluid Film or the like.
If you don't care about aesthetics, you can patch it, what you can also do is use fiberglass cloth with some foil tape as a backing and try your best to contour to the panel. Build up the glass layers and use some kitty hair filler or plain-jane Bondo for final finishing and prime/paint it.
If you don't care about aesthetics, you can patch it, what you can also do is use fiberglass cloth with some foil tape as a backing and try your best to contour to the panel. Build up the glass layers and use some kitty hair filler or plain-jane Bondo for final finishing and prime/paint it.