Blast Furnaces and Distillation Units can all use the same 3x3x3 block of casings as other Blast Furnaces and Distillation Units

[C1ffisme]

Yes, these are all valid multiblocks and they all work.

[Eelt]

Yeah, this is is an issue that I presume affects all versions of Voluminous Energy that has multiblocks.
I probably won't rush a fix for this, but I will get around to fixing this eventually.