I just installed and tinkering around a little; it's a super cool concept.
While obviously much different than regular functional modding, but custom spritework would be awesome for a concept like this. It'd also allow you to make the construction much larger; the current footing for a space elevator is quite small imo.
Functionality wise, it might be an idea to merge the side chest and tank into the main entity?
I haven't had much time to try the functionality out because I'm not yet at Aquillo in my modded planet playthrough; There are some popular planet mods which might be cool to look into compatibility wise (for example, Muluna and Cerys are moons, maybe it's cheaper to construct there? Marraxis is an ocean planet, is it even possible to build it on there? Can it be built in the Trench (haven't tested) of Marraxis? Wouldn't make much sense if it can be.
I played around a little bit with the construction in editor, and placing the foundation works fine. It does not place the chest and tank until I open the interface however, and when removing the foundation these two are unremovable using editor, which is probably not intended.