hmm, i've added them to the game "Personally use" and added some requirements like just build on that planet, and some certains building is needed

But it would spoil the gameplay to make every ship makeable without any fight

The Tau'ri should be weak in the start and grow more powerful, aswell as Goa'uld is pretty advanced against Tau'ri in start but is slightly even with them when fully advanced (Tech 5) That's my opinion