Can you retrofit units and weapon platforms??

There is no way to retrofit units or weapon platforms yet, but it is coded into the game (I believe), it just needs to be hooked up to the UI.

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Give me atmopshperic manipulation cannons, or give me death!

Aye, what Thy Reaper said. Its in VehicleUnitTypes.txt, and apparently only mines cannot be retrofitted.

Unfortunately, only ships and bases show up in the retrofit menu, thus, none of the units can practically be retrofitted.
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I'll make one later.

I suspect once it happens, it'll be a "all the units of this design" thing instead of clicking on every individual unit. Ideally, scrapping facilities/units should be done like this too.

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Playing Touhou games (Go to this Wiki if interested. No, nobody else is that good/insane as that replay). No rush for SE

You can already upgrade facilities all at once, simply click the multiple production ques in the production menu and hit upgrade facilities, each planet will add an upgrade of any new facilites to its existing production que.

It would be very nice if their was a upgrade units button

Groovy Baby Yeah!