I think it depends on your ability to replace them or resolve the loss of structure. If you can remove what I call the bulk head above the windows and replace it with solid welded in square tubing or even angle iron, plate steel of 10g or heavier you should be fine.
Personally, I could add a temp support below the removing section and add the replacement above it . A few may be needed even spanning from rib to rib before and after the removed section to help transfer weight to supporting ribs. The best way I can say it is, you are building a regular wooden framed wall, double boards above openings like doors and windows, the same rule applies to our buses.
Just in this case it is all steel on steel, welding is the ticket. Transfer the weight load and any structural requirements for flex, bending, weight carry to other structural areas. It should not be too hard to do but, I have become a solid metalworker after getting my bus and being forced to do a lot of this work myself. Now, it supports me financially which is good because I enjoy doing it but, it takes a lot of time away from my bus.
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D.L. Jones III
"The Independence"
98 International
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