[Suicide Junkie]

You can have as many of any component as you like, except for those that are specifically restricted to one per ship, or such.

Adding too many engines can have wierd effects, but the limit is 5120kt worth of thrust. Beyond that, it wraps around to zero and starts counting up again.
Don't worry about ever seeing it crop up in a Gritty game.


Those upgrade issues were fixed a couple patches ago...
I'm not sure why the PBW game hasn't updated to use them.
Numerals fixed for v1.11