The breaktrough technology is supposed to be the liquid H2, ……should be compact enough to be retrofitted in existing airframes. Hence their idea of converting an existing lightplane.
No, not really, LH2 can’t be stored in the wings which is where the kerosene normally goes. Fuselage storage leads to CoG problems unless the pax number is halved. Now your wing fatigue design doesn’t work as the fuel mass offsets the bending moment. Then there’s the problem of purging the leaked H2 from around the cabin tank, with H2/air extra large flammability range and min ignition energy it’s becomes explosive;- the Tu155 couldn’t do this even with a He purge system so they gave up after just 4 flights out of a planned 100 (note 96 further flights were undertaken with LPG)