Tartare,
Hydrogen is relatively energy dense, about 3 times Jet A-1, problem is it's the lightest element and even in liquid form under pressure, it's about 4 times the volume of the same amount of Jet A-1.
This would mean larger fuselages as more efficient to have large tanks in fuselage, larger wetted area but less weight, wings would need a redesign as without fuel tanks, a stronger, more rigid structure is required. Double bubble fuselage might work just fine.