In Refined Storage 1.1.2, Interfaces appear to have a uniform texture on all sides. They also serve a similar function as the Applied Energistics Interfaces. However, unlike AE's Interfaces, RS Interfaces are sided.

Issue #224 makes it clear that this is, at the moment, intentional. I would suggest changing the texture of the Interface to imply that the block is sided.

If it is reasonable, I would also suggest allowing it to be rotated to allow the extraction side to be something other than the bottom.