Teardrops n Tiny Travel Trailers

As a result of pulling out the fridge and stove, we will have large vent holes left in our vintage Shasta. Eventually, I'd like to re-do the aluminum skin, but my question is how to patch these large holes in the meantime?

I'm sure this is on the boards somewhere, but my searches are resulting in a ton of threads that don't address it. If someone knowledgeable can point me in the right direction, I'd appreciate it!