so, i know there are only 4(5?) in the mod+Home One. however, i feel that some more should be added, so that Mon Calamari shipyards feel more useful. options would include Mediator, Buildable Independence class(buffed some to be an SD killer, like 9,600 credits, but replaced at the same time the liberty is), Wingless liberty(like in Balance&Flavor), MC75, or the Recuscant, since it was built be Mon Calamari and the Rebels used some. alternately, we could add Incom Corporation to it to build cheaper starfighters. if you can't/Adds nothing to mod, then disregard.
as for Shipyard corporations, maybe make them a buildable SPACE structure, that takes the place of a Golan. also, make Kuat Drive Yards buildable on Byss. like above, if you can, great. if not, disregard.
these are suggestions. as always, do with them as you will.