Appropriate number of functional concepts?

Hey guys, apologies for abandoning my own thread briefly (it’s midterm season).

I guess I took the numbers from the other thread a bit too literally, the number had just stuck in my head for some reason.
I have some more materials research to do, and looking into codes and standards, so I won’t close the concept stage until I absolutely have to move on. I’m planning on starting production CAD around mid April so we can move into prototype production and testing by May, so I still have some time.

Thanks everyone for your help. Haven’t gotten approval yet to make it public, but hopefully I’ll be able to show some process soon.