If I were your GM, your Clan Elementals - with or without battlesuits - simply wouldn’t fit into or be combat effective inside of any spaceship or section thereof built for normal humans.
I recall one boarding instance in canon using BA (a single suit even), Finding Jardine. The fight pretty much ruins the ship.
So battle armor may not be your first choice, or a choice at all, for a boarding operation in space. It will typically be regular-sized infantry in space suits.
Also, early sources were explicit that firearms shouldn’t be used on spacecraft. The weapons of choice are blades or perhaps low-penetration needlers/flechette guns.