@archsimkat Not if the "land fab" ACU can make engineers. Those would have to be disallowed. For a "land fab" ACU to have value, you'd need it to be better in some way than just using a T3 ACU make a t3 factory and making units that way. But it couldn't be able to make T2/T3 engineers or it would be too good.
Instead of having a separate upgrade path, maybe just allow a Cybran T2/T3 ACU to also make certain units that would be useful for raiding or breaking enemy PD.
For example: T2 ACU could make moles, mantis, medusa. T3 ACU could also make deceivers, wagners, hoplites, vipers.
It could be implemented by making something like "crab egg" for those units.