When the MFT-A is set to the sphere, or sphere framed variants, MFT-S-1-0 has no tank. MFT-S-2-0, has a single sphere, but split into 2 hemispheres. This seems counter-intuitive. Seems like if the end result is a whole sphere, it should be joined into a sphere. (I'm in career mode right now, so the spherical tank itself is not available, so if the spherical is different, then maybe this is as designed, so both design options are possible). Also the upper/lowers default to 2-1-Flat, but there is no option for no upper/lower at all.
Not critical, just a little odd.

Saw answer on forum. Nevermind :)

I'll leave this open for a bit -- might be some opportunity to improve the MFT part with regards to the spherical tanks.

Perhaps rather than having the -S variants built into the -A tank, split them off into a separate tank (as they were in previous versions). The MFT-A would keep the stand-alone spherical end-caps, but the MFT-S would use a pre-welded setup.

• MFT-A would keep spherical end caps, remove spherical bodies
• MFT-S would have only spherical body options
• How to weld the end-caps into the spherical tanks, while still allowing for independent selection of the top + bottom caps?

OK, let me know if you need anything tested. That said, the spherical tanks really don't get used much (by me)... though I love them. I like the look of things like early von Braun lunar orbiters, the Colliers rockets, etc, and the framing of the sphericals is too current for that rocketpunk look, perhaps :D

Maybe if there was a better boiloff for them since they minimize surface area per unit volume? (perhaps there already is, and I am simply unaware of it).

I did prefer having the spherical tanks as a separate part, as in previous versions.