Correct. I tried to explain as much in the updated OP, but maybe I wasn't clear enough. The PCB will be produced with the electronics, to include the ATmega32u4 controller chip and any diodes, already installed by the fabrication house. The only soldering required will be when you mount your own switches in the board.
Any plate design we choose will incorporate the cutouts on the sides for removal of the switch housing cover without desoldering from the PCB.
I think we will be selling PCB and plate as separate units, so you could purchase only one or the other, or different combinations of them.
We won't be selling switches, cases, stabilizers, LEDs, keycaps, or anything else. You will have to source those yourself, if you don't already have them.