i know the designs would be unbuildable, but for the existing units it would probably cause problems, perhaps changing the components to the next thing on the list.
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...the green, sticky spawn of the stars
(with apologies to H.P.L.)
Existing troops will not cause problems... they will work like normal. You can even build more, but you will not be able to make new troops with thoose weapons.
I know this from testing new weapon designs in my mod.