Good job @scrufferpops.
Some great stuff there. Id like to see modules that suit professions / missions - so extra life support, med bay, docking unit, hull clamps etc. for salvage / rescue.
Recon cameras, armories, intercept tech, countermeasures etc. for intel /recon.
Loads of good ideas suggested already. But you get the gist - specialist equipment that takes up cargo space / hardpoints to give you an edge for a specific challenge.
Also love the idea of expensive upgrades which give increased cargo space, longer jump range, external long range fuel tanks, solar sails etc., some already mentioned. External cargo from hardpoints – higher risk - less protection for cargo, but cheap way for traders to work with smaller ships.