Hey, wanted to talk about this mod and Maraxsis. Not with regards to changing or adding extra steps to its science because of the Trench and the need to ship in pressurized atmosphere for the underwater domes already.
What I think will need some attention is with the science vessals you can unlock/make with Maraxsis. In case you do not know about them they are basically just barrels for science but with an actual advantage in terms of science per inventory slot and rocket limit.
Right now player can, once unlocked, use these science vessals to ship science without any of the challenge provided by your mod. I think the important thing is to preserve the challenge that your mod adds without making the advantage of Maraxsis' science vessals useless.
Electromagnetic Scienc, probably doesn't need any additions since it is a one-time thing where the player would still be able to barrel the science packs into a vessal on the space platform you charge them on. But you could add vessal recipes for the uncharged science pack so the benefit for launching rockets isn't lost.
For Metallurgy science it should probably also alter the Maraxsis' barrelled/unbarrelled recipe. Either by lowering the science input/output count for the recipes or adjusting the stacksize and weight of the Metallurgy science vessal.
For Cryogenic science there is a similar 'problem' where these vessals would let you bypass the need to keep them cool. You could do something similar to how Maraxsis itself already handles Gleba science where the gleba science vessal simply spoils into a vessal with spoilage. The bigger question would be if you then also want to add variations to your recipes so players can cool such a cryogenic vessal directly without having to unbarrel it each time.