Sorry for the trouble, but it seems Cellars is just Broken at the moment. I will probably just remove it in the next update
I am playing TerrafirmaPunk 1.0.0 and I can confirm that the cellars mod IS working correctly. I believe Egeis is referring to the fact that the cellars mod itself has just recently updated for TFC 79.16+. One of the changes was the ability to create any shape or size cellar so long as the wall is never more then 3 blocks from the icebox. The pictures and instructions have been updated to reflect this
however, the example design shown in the new pictures WILL NOT WORK with the version of cellars currently in TerrafirmaPunk 1.0.0.
In order to build a working cellar in the current version of TerrafirmaPunk (v1.0.0), it needs to be a very specific shape. I will do my best to describe it in four slices so to speak, looking from the top down. Each floor is one block high.
Again, the cellar needs to be built specifically like this in v1.0.0 in order for it to work.
W=Cellar wall
I=Ice bunker
D=Cellar door
S=Cellar shelf (the number of these are optional up to a maximum of 12)
N=Nothing/Empty Space
Base
W-W-W-W-W
W-W- I -W-W
W-W-W-W-W
W-W-W-W-W
W-W-W-W-W
N- W-W-W -N
First Floor
W-W-W-W-W
W- S-N-
S -W
W- S-N-
S -W
W- S N-
S -W
W-W-D-W-W
N-
W-D-W -N
Second Floor
W-W-W-W-W
W- S-N-
S -W
W- S-N-
S -W
W- S-N-
S -W
W-W-
D-
W-W
N-
W-D-W-N
Roof
W-W-W-W-W
W-W-W-W-W
W-W-W-W-W
W-W-W-W-W
W-W-W-W-W
N-
W-W-W-N
Also note that the cellar will continue to say that it is incomplete for several minutes after you finish constructing it. Wait 5 minutes then check the ice bunker again, it should then give you temperature meaning that it is finished.