This is a panel I fabricated for my GN. It holds an ls computer securely in place. It is made out of 6061 aluminum, .090" thick. The cover is held in place with 6mm screws, into threaded rivet nuts. Powder coated black. Foam seal already glued on back. Only selling cause I switched to Holley efi, and it's not a good fit for that. I can make more, if there is an interest.
I can make them to fit the Holley computer inside the cabin, on the back of this plate as well. I would recommend running a catch pan for windshield run off. I have made those too, with a fitting for a drain hose as well. Asking $180.00