I'm considering getting another UNIX layout based board or an ortho as the layout intrigues me.
Welcome. As another UNIX keyboard user, I recommend considering a bucking spring from UNIComp, I have 2, they're amazing. I also have 2 of GONs TKL PCBs and one of his cases, I'll be making keebs out of them later this year. 1Up sells GONs TKL PCB, so once they get rolling again they should be another valid source for his PCB - I ordered mine from him via email/paypal and received them in about 3 1/2 weeks - 2 weeks ago.
There aren't a lot of other options with the 1x1x backspace switch setup (the rest of it is programming). If you find others let me know, I'm always on the hunt. I have 2 UNIComps, 2 Gons TLKs, a HHKB Lite2 and a MassDrop Z70.