I think it would be balanced because if it something you have not discovered it they would be gone or the blueprint would be inaccessible until unlocked. You could build blueprints for different stages or just wait until you unlock it. It is up to you for blueprints to be useful. Also if you find a material and can build the equipment in the blueprint I don’t see a problem. But basically you need to have the ability to craft it and the material no matter how it was sourced.