I considered building one but thought it would be superfluous as I have two full size teensy powered builds already, one of which is a southpaw. My first mech not so long ago had black keycaps so I always used backlit keyboards to see the legends at night. I keep the light off so as to not upset my circadian rhythm.
Recently I bought a knock off pbt carbon set and realized the white keys were legible by the light of the monitor so I could be more flexible in the future.
My customs are low quality budget builds so I can't sell them and they would sit unused if I built another. I think If you go for a custom you should do it as high quality as you can with a plate and case.
I'm still in my formative years in keyboard usage so i've started to try out ortho and am considering the arisu. I don't want to build more than one keyboard a year to keep spending from getting out of control. I built a 60% and a 50% this year so i'm over my quota.
edit: you should use a keepout zone under the crystal, might help to move the xtal traces away from neighbouring pins too.