So yeah, I added the remaining dripstone blocks that are intended to tile together to form large stalagmites/stalactites.
BSL v7.2 BSL v7.2 Kappa v4.0 Kappa v4.0
Also, I added the lightning rod using a copper-based material
BSL v7.2 Kappa v4.0 Kappa v4.0
As a teaser, here’s also the first rendition of the sculk sensor for Vanillaccurate (Substance render)

and in-game showing the off and on states. I haven’t designed the tendrils yet.
BSL v7.2 Kappa v4.0 Fraction
By the way, I didn’t get the opportunity to properly showcase candles, so here are some of those in-game with the latest Optifine-supported 1.17 snapshot (that is, before the switch to OpenGL 4.6)
BSL v7.2 BSL v7.2 Kappa v4.0