Here’s the F35 carrying a single AIM120 and GBU 31 per bay. It appears to be able to carry 3 AIM120s across with enough height to carry 3 AIM120s deep; lets not get carried away here, the need for ejector arms would make any attempt at fitting 9 AIM120s per bay impossible. But anyway it also has a similar length to the Raptor’s bays. Again we have small gaps on either side of the weapons and between them. Lets call the width and height 580mm, which is enough to fit the 458mm GBU31 and then some as depicted above. That gives us 1.3 cubic meters of space.
Seat width has varied over time. In 1985 none of the main four US carriers offered a seat less than 19 inches wide. Since the beginning of the 21st Century until 2018 average seat width decreased from 18.5 to 17 inches, and sometimes as low as 16.1 inches.
I’m not sure whether to be impressed or horrified that loading someone into an F-35 bomb bay is more luxurious for plus-sized passengers than a typical commercial airline seat.
sanity-checks dimensions
https://www.quora.com/What-is-the-size-or-size-estimation-for-the-F-35s-2-internal-weapons-bay-and-the-F-22s-3-internal-weapons-bay
580mm=22.8 in wide
https://en.wikipedia.org/wiki/Airline_seat
I’m not sure whether to be impressed or horrified that loading someone into an F-35 bomb bay is more luxurious for plus-sized passengers than a typical commercial airline seat.