[jc173]

You can mod the facilities file so you upgrade from a normal shipyard to a temporal shipyard. Not sure if that's really plausible, but then again temporal tech in general may not be plausible. Just swap them to the same family and give the temporal shipyards higher roman numerals. I did this primarily so that the AI can utilize them since from what I've seen it won't scrap a normal shipyard and build a temporal one. I'm using a mod that borrows the advanced shipyard and advanced temporal shipyard from an older mod (Dman's mod I think). I put all the shipyards in the same facility family and you can upgrade up the whole chain.