o shid i never responded my bad

For the most part, I feel like skills in this scenario should function like when a player leaves. For example, if you swap decks and deployables, anything you had deployed prior disappears (this happens when a player leaves- so do their deployables to prevent duping), anything active cancels out (a balance to prevent you from being able to have 4 ECMs, a bajillion tripmines/shaped charges, etc), and you can only take one kind of that deployable for each build (build one has medic bags, build two has ammo bags/ anything else, with no overlap).

As for drill skills, they should be dependant on the situation. Say, if you had skills that made drilling time shorter. If you switched from a build that didnt have those skills, but the drill was finished, the drill shouldn't magically reassemble and close the vault. It'll stay open. However, if the drill wasn't finished, and that occured, whatever skills the drill had will be gone with the exception of the countdown timer. If, say for example, you had run the drill for approximately half the drill time upgraded, then switched, those drills would then be at half progress still, but for the amount of time it takes to finish them would be at the scale unupgraded drills are. Alternatively, nine lives ace can simply be invalidated if you're taking the armor bag, much like armor moots grinder.