There's nothing wrong in cutting a hole in the mounting plate as long as you have welded it inside and out so that it does'nt cut through the shock mount plate. I personaly would have ground a 45 deg 1.5-2mm weld prep (as you should be doing with all your thicker plates!) all around the edge and welded solid with about 160amps. Reguardless of what any body says on here by the time the rollbar has hit the ground hard enough to punch a 40-50mm hole through the 3mm plate the 'I told you so' will be the least of your problems.
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