I've been working on the Water world. Not complete, but heres a screenshot.
Not really sure what you're on about with all that math. I just found out that the Constructor units match the 4x and 8x cubes perfectly in size. The only minor challenge was figuring out what texture scale to use for the "studs" on top.
Assuming you use the default textures for the top and sides: the scale for the top is
0.0325 and the scale for the side is
.25 . All you then have to do is align the texture to two of the sides of the brush.
Not really sure who or what you are referring to Killer2. There have been some shoddy repackaging attempts of my maps, maybe a poor emulation or two, but not a proper replacement or competitor.