For a moment I thought “weird, two people who went for the nonviable Rock Crucibles”, and then I realized “oh right he has Bob in his name, not to mention the Bobmazon catalogue in his Mod” XD
Yeah the Stone Crucibles will continue to exist and be craftable, but they will be hidden from NEI so people dont think by accident that this is a good Idea.
Using an upsidedown Slab above the Crucible helps with the whole walking into it problem, since you cant walk into 1.5 tall places in 1.7.10 (unless Et Futurum Requiem backported that sneaking Feature)
Edit: Also just a random did you know: those zigzag Factory Roofs (such as in your NTM worldgen). The vertical parts of those are actually windows, while the diagonal parts are the roofs, this is to make ventilation for the building easier. Meanwhile you have a solid chunk of bricks for that Roof XD