I scrapped the mod and never released it.
Earlier, I saw this thread and decided to redo the mod and release it.
Features:
* Voxel & model blocks!
* Blocks are snapped to a grid!
* Build and break blocks!
* [Relatively] easy to add your own blocks!
* Uh, that's about it
Credits:
* Nash - 3d model for blocks
Screenshots:

Known bugs/bad things:
* None, looks like you guys need to report some
Custom content creation:
I'll write a tutorial later, but for now, have a tool that'll help you convert
reskins of the block model into a voxel, so it can be used in software mode too:
https://dl.dropboxusercontent.com/u/707 ... to_kvx.zip
Download: