This is awesome, I love having different levels of our glorious spidertron.

Any possibility of making this compatible with the equipment that Krastorio 2 adds (the different tiered lasers, etc)?

I've never played Krastorio 2, but I'm all for mod supprt

What specifically should I add?

I'd hate for you to go to a lot of trouble but that sure is nice of you. Here are the added equipment item names in that mod (from the equipment files):

name = "advanced-exoskeleton-equipment"
name = "superior-exoskeleton-equipment"
name = "additional-engine"
name = "advanced-additional-engine"
name = "vehicle-roboport"
name = "battery-mk3-equipment"
name = "big-battery-equipment"
name = "big-battery-mk2-equipment"
name = "big-battery-mk3-equipment"
name = "small-portable-generator"
name = "portable-generator"
name = "nuclear-reactor-equipment"
name = "antimatter-reactor-equipment"
name = "cyber-potato-equipment"
name = "energy-absorber"
name = "big-solar-panel-equipment"
name = "imersite-solar-panel-equipment"
name = "big-imersite-solar-panel-equipment"
name = "personal-laser-defense-mk2-equipment"
name = "personal-laser-defense-mk3-equipment"
name = "personal-laser-defense-mk4-equipment"
name = "personal-submachine-laser-defense-mk1-equipment"
name = "personal-submachine-laser-defense-mk2-equipment"
name = "personal-submachine-laser-defense-mk3-equipment"
name = "personal-submachine-laser-defense-mk4-equipment"
name = "energy-shield-mk3-equipment"
name = "energy-shield-mk4-equipment"

I'm pretty sure you can already use all of these by default