Even when you unscrew/install a new piece, it's not permanent. Glued isn't even permanent. (Think about tiled floors that get replaced.)
I understand many people aren't inclinded to grab a screwdriver and do installation. So, this point about a layover piece is valid. It might get more sales (if layover). But, if the point is to get a factory-like appearance with integral location of switches, I think the OP is on-track and should ignore votes for a drop-in part. Console installations are, after all, very simple.
I like the stacked location of the glass-holders. Making them sufficiently deep to avoid spills is critical. As is, the OEM bottom, shallow tray isn't good for anything. Cups, change, nor a phone will stay in place w/o sliding off under a seat. IMO, the factory center console is laughable.
Whether it be an aftermarket piece, or a suggestion from other automobile, the need for a better-designed center console is huge for these vehicles. On the switches issue, reusing factory switches (in their original harnesses), is best. OTOH, delivering a new piece with plug-in 2/3-gang switch plate also has merit. Consider a smaller triple-gang setup if you're having trouble with switch placing.
I vote for continued effort on this project. And, I'm curious how the plastic will be molded/formed. Does the OP have equipment necessary to do injection molding?