Hi,
First of all, very promising looking tech tree! I'm always looking for ways to organize my weird collections of mod parts.
I see you've included kOS parts in the .cfg, even though there's no mention (that I can find) of support for the mod. They're kind of all over the tree since they use the stock tree nodes. I think the "4 Bit Computers" to "SuperComputer AI" branch would be perfect for them.
My humble suggestion:
4 Bit Computers:
kOSMachine1m (CX-4181 Scriptable Control System, stock tree science cost 45)
8 Bit Computers:
KR-2042 (KR-2042 b Scriptable Control System, stock tree science cost 160)
kOSMachine0m this is a legacy part, and cannot be added via the editor
16 Bit Computers:
kOSMachineRad (CompoMax Radial Tubeless, stock tree science cost 300)
SuperComputer AI:
KAL9000 (KAL9000 Scriptable Control System, stock tree science cost 550)
And "Cherry Light" is just a silly rotating light which can, in my opinion, stay in the node it currently inhabits (Advanced Electrics).
By the way, why is "LY-10 Small Landing Gear" in the unplaced-node, and not in e.g. "Landing", which is an empty node with stock parts only?
EDIT: Oops. Just noticed there is a pull request for kOS parts. That'll teach me.