Hi! Nice work on the mod, etcetera!
I tossed together some configs for compatibility with a few other mods, if you want to use them. They are:
1. USI-LS. Gave it a space to store Supplies, a built-in recycler, and hab-time bonuses, all enough to last for a ~110 day trip to mars, if fully loaded with 104 kerbals. The recycler is a liiittle bit overpowered, but it kinda has to be in order to avoid eating into the delta-v budget to an unreasonable degree.
2. KIS. Gave the ship a large storage space on the inside, and the tanker a slightly less large one. The problem is that with this many kerbal seats, the right-click menu doesn't actually fit on the screen because KIS wants to give all of them their own inventories. Not sure if there's a way to get around that.
3. SMURFF. Just a tiny file to make SMURFF ignore the spaceships, booster fuselage, and engines.
They probably aren't perfectly balanced, but afaict they hit roughly the performance levels that they should. (though i admit i haven't played with KIS much, suggestions welcome there)
(I also made a modified version of your cfgs that half-scales everything (6m diameter, 28 kerbal seats) so i could have a somewhat more kerbal-scale ITS (and so it would actually fit in the VAB ) but i might need to play with the drag numbers- if it's empty it practically floats down to the ground at 100m/s once it gets through reentry. That could totally be one of the other mods i have installed screwing things up, though. Needs further testing.)