You can already make solid CNCT, you just need a bit more effort. First, CNCT can stack vertically without falling to the side. Second, if you want to make floating CNCT, put a layer of ANAR underneath the CNCT block, and make sure the sides are blocked by CNCT stacks.

Wouldn't that be BRCK though? It's made by placing a cement like liquid under high heat so it basically is concrete.

BRCK can be strengthened by placing stronger materials inside the BRCK, kinda like reinforced concrete.