I don't want to just paste the upgradability to other mods. The tiered approach fits for Bob's mods, since they contain other multi-MK-turrets. Without Bob's, this doesn't make much sense in my opinion, no other vanilla turret has tiers. I'd rather write an integration for SE, to make it fit just right.
Though this needs a bit more insight on my end, I never really played SE. If you already have a possible progression in mind that fits the style of SE, please share.