they should definitely have reclaim ability, they are engineering stations so they should be identical to engineers
experimentals themselves can probably be made unreclaimable like ACUs are (removing RECLAIMABLE category I guess), and idk if I ever saw anyone capture an experimental, when you capture you are doing a huge gamble that you will finish the capture, because if you stop capturing at any point (including because the only engineer/station doing the capturing got destroyed), it goes to 0% and all that capturing you did was for nothing, but if you do manage to capture it, you get an entire experimental to NO U uno card the enemy with (even if like I said, I never saw it happen ingame), meanwhile damage you do through reclaim is permanent and instantly applied to the unit, even if engineering station gets destroyed afterwards, making it the safer option
the problems I mostly see is someone reclaiming enemy exp as it is about to die, ex. chicken, which causes its death effect storm to not spawn at all, or ex. GC to not fall down and deal death aoe damage, not just raw damage from stations
also why should stations not be used as defenses? engineers themselves are often used to reclaim enemy engineers/units when in range (see early senton island fights), I often use acu to reclaim enemy buildings/units when it does more damage than gun (if you have engineering upgrades), imo build power in itself is a weapon that can and should be used, not sterilized because "engineers shouldn't be able to fight"