Hello folks, my first post here. I'll add a bit to this if I may as I've spent many hours smacking my head on the bomb bay of all the Nimrods.
Theres actually 4 bomb doors, we used to refer to it as flaring the doors. Stores load was usually done prior to refuelling, occasionally as we were refuelling, but you had to stop at about 20k or the Jet sat too low on her oleos to get the stores under the door. The front doors actually flared slightly more than the rears as the were under the engines. For some loads such as special weapons, the plumbers went in the rear, the very back of the bomb bay has two panels that opened, it was called the 'ducks ar$e' by us lineys.
The bomb bay is a very detailed area of the jet, it changes shape several times and has all sorts of bits of kit in there, from the split flap servodyne to the hydraulic accumulator gauges. If you are going to model the jet on the ground with the bomb doors in the open position (the jets were always parked like this unless they were going to sit for a period of time) then don't forget about the bomb door lock thats were fitted immediately on shut down, the lanyards left dangling on the outside.
On the subject of the doors drooping, we used to have a great practical joke for the new guys. We would have them in the bomb bay checking the hyd accumulator gauges, on the nod from someone outside, you would select the bomb door system to the 'red' system. This powered the brakes and was used in emergencies for various systems inc the bomb doors. This would immediately pressurise the system and flex the doors !! This moved the doors about 4 inches outwards with a loud bang that would shake the jet, it was highly amusing to see new bloke come out the bomb bay like a rat up a drainpipe. (I should point out that because of the bomb bay locks you couldn't actually move the doors open or closed and you made damn sure they were in before flexing the doors).