Base editing is so tough for someone like me. I wanted to speak from the point of view of a very intimidated and unknowledgeable base builder. I would love to be able to build a really pretty base, but after seeing an option one time to lower or raise sections of the floor and ceiling, then taking over 30 minutes just to figure out how to get that to pop back up, I gave up on any hope of making a great looking base. I doubt it would ever become easy for someone like me, but it doesn't really appear to be intuitive for the moderately abled player.
I would really love to see something like skins available to use for rooms. It would be a starting point that could then be customized by the owner. For instance, I looked all around and could not find any ice themed pieces, walls, floors, etc. in the editor. I wanted to make a snowy, icy room, like you would find in the Frostfire mission. It would be nice if there were a preset option "Ice Room" that could be clicked and then I could layer my own personal taste items over it. Is that probably asking too much? I really don't know but thought I would throw it out there.