Cab light help

[Thebrownturd]

My truck has factory cab lights with the raised light perches and welded in nuts to screw to; however, when I attempted to take the screws out a while back a lot of them broke off in the nut. Some of the nuts even twisted out of the metal and I am left with a square hole. I know the problem lies in the fact that sheet metal screws were used instead of machined screws and a little rust doesn't help either.

Does anyone have any good ideas on a fix? The PO twisted some of them to the side and drilled new holes but the problem with this is they are all cockeyed and facing random direction.

Could I drill out the twisted off screws that stuck in the nut and use a larger screws? What about the large square holes that have nothing to screw to?
Thanks for any advice. I need to figure something out before we go to paint.