Add armor variations for each tier with class themed abilities. Frame classes have the ability to interface with a 'Buddy' which provides extra functions on their respective class branches.
Huh, interesting. That's probably because the organizer is a weird item type (item with inventory) that's not used in many other mods, so it's not covered as a case in Reverse Factory.
I handled it on my end, should be fixed in version 0.5.2 that's just released.