stiffening pieces to weld into frame

look closer at the pix, in the corners especially where the firewall and inner fender meet at the welded in brace, and where the shock tower meets the brace it looks like the metal is open on purpose for drainage in these 2 places. id personally just make those two holes slightly bigger. the dimpled or bevelled holes are there prob for 2 reasons, one for light weight, and to allow the area to dry out if it gets wet, and the bevel is to get the strength back up in the sheetmetal after punching a hole in it to lighten it up.

i see the bevelled holes in aircraft structures all the time, especially in fuselage former frames below the fuselage floor line so cables, wiring and ductwork can be run, and in wing ribs to lighten em up, run fuel lines, wiring for boost pumps, and maintain the strength of the part. this is why i like it it looks too cool, plus US car tools reputation for good stuff. id been waiting to see pix of that and their rad support.

im sure both the dillinger frame bars and the US car tool bars are both fine products and will do what you need them to do, its just a matter of what way you like it to be done. sheetmetal and a seam weld, or with tubular steel.

how about adding a set of "export braces" and a "monte carlo bar" both mid 60s mustang items. the concept which can be applied to our cars with chromemoly tubing and heim joints possibly? any other ideas on that one?