I am definitely not an avid welder but have done some on my Falcon. From what I know of getting parts or assemblies welded it cost quite a bit. Especially when it came to fabricating and welding.
If it was me I might look at fabricating a cover that is fiberglas. Not sure if that is feasible in this situation but I am sitting in my motorhome in Arizona and looked at the fiberglas engine cover in here. I can tell you from experience that fiberglas is much cheaper to work with.
I did build my fiberglas surround system for the trunk area and I had zero experience with fiberglas. It looks good and was pretty inexpensive in comparison to welding. You can see the work in "show off your ride" in the "update pics" by Badbird. Just a thought. Larry