Sproxel exporter textures are created by projecting the color of the last voxel into six sides
something like :
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xxxxxxxy -> y
yyyyyyyx -> x
zzy zz -> z
so you cant have a inside texture for the third row, because the last voxel is the one that gets projected into the texture.
This is a flaw of how the nodebox works.
I once asked for a .3mp (a common voxel formar iirc) to be added to minetest precisely because of that problem.
Edit: regarding the texture alignment problem that twoelk experienced, i believe i fixed that problem in my last revision of the script.