Spot welder access?, what are these holes for and can I weld them up? Options

[amfab]

I always assumed the big holes—the 3 or 4 inch diameter ones like in the floor pan and the rear trunk floor that have the twist-in caps—were for spot welder access during manufacturing.

I see there are some other smaller detents—maybe 1-3/4in diameter with half moon cut outs creating a sort of flap near the pedal cluster for example. Were these for the same purpose? Maybe they had an odd spot weld to get to, so they bent them open, did the weld, then bent them back and seam sealed them closed?

If this is the case, is there any reason—other than authenticity—to not weld them closed while I am cleaning up the body before blasting and priming?

Thanks In advance

-Andrew