I designed this THE60 PCB mainly for people using 40% layout like me, who have to switch the way of typing on non 40% keyboards.
The PCB is QMK supported.
I recommend to use it as plate-less.
And I also prepared plate CAD file: Plate CAD file for THE60PCB
When assembling, two switches will have to be modified in order to avoid the studs of the case.
THE60 PCB is sold for 15USD along with THE60 kit.
If sold individually, it's 25USD without shipment fee.