"Things you build yourself" aren't really in competition with pre-built things for most people. Also, that Dilemma costs over $200 for an RGB PCB plus case. Add brand-name switches and keycaps, and you're not far off the price of this, and also you had to do the assembly yourself.
I would recommend buying a Dilemma instead: https://bastardkb.com/product/dilemma/
or building one of the hundreds of DIY open source keyboards e.g.:
- https://github.com/mmccoyd/hillside (46-56 keys)
- https://github.com/GEIGEIGEIST/TOTEM (38 keys)