Repairing Exterior Wall on Tent Trailer?

I have a 2000 Coleman Messa with a manufacturer's front storage compartment that leaks. I need to remove the storage unit (rotted particle board) and create a new weather resistant front exterior wall (ie. the side and back walls are all intact with the weather resistant metal wrap). Without the front storage compartment I will need to build a new front wall and wrap it with some kind of weather resistant material. I welcome all suggestions. Thank you.

By Nancy from NH