[Maybe disregard this, as I'm not your requested audience, and I realize this is a tech/biz post to HN and you are deep in the details of confronting the unknown, but...] I think for pitch-deck/public communication, as soon as you say "hydrogen aircraft", immediately address or at least acknowledge "what could possibly go wrong-Hindenburg" and "why not batteries" (not para 3).
EDIT you could defer the issue with "Fuel cell electric aircraft"
EDIT Since I'm already downvoted, I'll add: I wonder about fuel cells for powered paraponts/paragliders, where battery-electric are available, but aren't quite there yet vs petrol, esp for range.
EDIT you could defer the issue with "Fuel cell electric aircraft"
BTW The first solar+battery electric aircraft world-circumnavigation got hardly any publicity, which puzzled me https://en.wikipedia.org https://news.ycombinator.com/item?id=9824570/wiki/Solar_Impu...
EDIT Since I'm already downvoted, I'll add: I wonder about fuel cells for powered paraponts/paragliders, where battery-electric are available, but aren't quite there yet vs petrol, esp for range.