As far as 3D (or in general non‐square) Betza extensions/analogues go, the only real problem is the different kinds of direction which don't necessarily correspond to the square‐board ones. But at least for Atoms that shouldn't be too big a problem: there's still plenty of capital letters left to go around; probably even enough to cover outlandish things like hex‐prism geometry if necessary
Directional modifiers (extending f, b, l, r, s, v, and the like) are more of a problem given the paucity of lower‐case letters left over
As far as 3D (or in general non‐square) Betza extensions/analogues go, the only real problem is the different kinds of direction which don't necessarily correspond to the square‐board ones. But at least for Atoms that shouldn't be too big a problem: there's still plenty of capital letters left to go around; probably even enough to cover outlandish things like hex‐prism geometry if necessary
Directional modifiers (extending
f,b,l,r,s,v, and the like) are more of a problem given the paucity of lower‐case letters left over