Thanks for the report. I've fixed the crash.
I had a look at K2+SE balancing, and as it is now, it will work as fine up until around Military 5 and Power Armor MK3, at which point you'll be missing out on that tier of guns and defensive capabilities. So if you are going to combine Spidertron Engineer with those mods, you'd probably want to disable it around that time.
Additionally, I don't know how travelling between planets and spaceships works in SE, but I doubt that it will work whilst in the spidertron.