Is there any way you could enable waterlogging on your multiblocks? At least your pumpjack? For underwater oil deposits, especially in a couple of my packs that take place underwater, it would be very nice if the player didn't see the odd waterwall textures. I know it might not make 100% complete technical sense, but considering there is no mod that allows for "oil rig" type building, your pumpjacks are the only option for underwater oil.

Just build a platform above water or perhaps even a small underwater base.

im not going to make the multiblocks waterloggable.