I like the structure! The only thing I'm confused about is: will we be playing the relic mission in full (landing strategies to finding the relics), or cutting straight to meeting partners? I prefer doing it in full because I love initiation, but I totally understand if you want to cut to meeting partners - it gets us to interact quickly, after all.
I have mixed feelings about using a discord server. On the one hand, I already use it for two other RPs, so it wouldn't be difficult at all. They are excellent for OOC communications. On the other, I prefer making character sheets and IC posts in threads so I can use formatting (and because it's harder to accidentally post early). I don't know if you meant the whole RP would take place over Discord, or only OOC communications, though. What I'd like is to do OOC on Discord and IC/character sheets on Iwaku, but I'm still in if you decide to do something different.