Cherry ML "Planck"Custom keyboard with Cherry ML switches. The switches and keycaps were harvested from two different keyboards. The orthogonal PLUM keyboard and a Cherry G84-5500LPMEU-2.
The PLUM keyboard is a long discontinued model. You can still find them in unused condition on eBay. The Cherry is an obsolete PS2 model that can be found for under $20 on Amazon.
The is powered by a Pro Micro. The matrix is identical to a GNAP! without the LED matrix.
laser foaming. The prongs have small nubs that click the keycap into place in the switch. These feel much more secure than the PLUM ones.