I agree I just noted too as in reference "half block" I think that's currently unstackable IMO annoying at least what I remember never rotate vertical, so the units are in full 1:1 ratios for blocks currently so that's why I didn't bother confusing some reading this conversation. That we could get by with only three blocks (if we could stack the current "half-block" and new blocks stack that way as well) but yes it would require six now to have a complete set without reprogramming.
Red is aware of the issue where you can't place two ramp blocks next to each other nor stack up half-blocks because they are still blocks and therefor cannot occupy the same block space. He's working on correcting this and also introducing scale-able blocks. I'm presuming this will all come out with the advanced crafting update and will likely involve converting blocks to scale-able and freely rotatable objects which will be free from the block grid limitations.