I'm encountering a couple of strange issues that I'm sure are a result of other mods interfering with things, but I can't quite figure out where to start troubleshooting.

Problem 1: I am able to mine the Whistlestop big entities. It provides the expected "Required technology: huge structure relocation" error message, but only after having already picked up the building.

Problem 2: Velora enemies seem to be completely immune to both bullet and grenade damage. Rockets still work, and they take damage from flamethrower puddles and laser defenses/turrets etc. Just not Guns (turret, shotgun, SMG) nor grenade (regular or cluster). I expect it's possibly the Distant Misfires mod that's making guns not work on them, but that doesn't explain the grenades...

I've uploaded a sample save here in case you'd like to see my modlist or test it for yourself. I set it up where I'm standing in between a large building and an enemy nest and I have some military things set up so you can quickly see both problems occur. https://drive.google.com/file/d/1x8h5K19qK0507yTfaHI9UEbFEZhG_p-p/view?usp=sharing

I took a look at your list of mods. Unfortunately, my internet connection will be extremely slow for the foreseeable future, and it will take more than a week to download all these mods.
Here’s my guess about the problem: the damage resistance for robots is most likely caused by a weapon mod or a mod related to another planet. Try disabling all such mods and see if that fixes it. If the problem goes away, enable them one by one and see what changes.
As for the buildings being mined, it’s most likely some kind of helper mod doing that for you. Unfortunately, it’s impossible to undo this demolition, so you’ll need to find that mod, and I’ll add it to the list of mods incompatible with Velora.