I mapped out where the block would need to fit into the cavity (I had to keep the mini switches over the middle pot for it to have a chance of fitting) and glued in some extra wood to help support the switch block.

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Routed for the switch block and then marked for some additional tweaking to accommodate the switch bodies on the underside of the plate.

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Switch block in and level with the cavity cover recess.

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I wanted to save the original cavity cover in case I ever removed the switches, so that meant cutting a new one. Some double-sided tape and a few strips of ply allows me to elevate the original cover so that the router bearing can guide along it safely as a template to cut the new cover on my router table.

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You have to take it slowly as you can still get a bit of flex with the double-sided tape if you're not careful. One new cover.

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cont.