Now seems as good a time as any to stress the fact that these are intended to be "Worlds" rather than "Planets".
If the goal were to simply create a crude replica of our solar system, all I'd have to do is update the interiors and slap on the old spherical DTS shapes. That isn't an improvement, nor a worthwhile use of my time. Blockland, and the engine it is built upon, isn't suited for a proper rendition of a solar system and as such I've altered my design.
I've already discussed it, but it deserves to be mentioned again; the goal isn't to create spherical planets. The goal is to create interesting environments to play on. What made the original map interesting was having separate build areas, not having poorly made planet-like objects. That idea of having separate build areas is perfectly preserved in this new map, and in fact will be improved upon thanks to the uniqueness of each location. Having the worlds be cubes solves and/or sidesteps a multitude of technical issues and at the same time draws it in to fit with the BL-style I've mentioned before. It makes little sense to have the terrain be square in appearance, and then to fall back to the old method of using spheres for the outside.