I always thought it was bomb stores but someone who served corrected me and said dump and, that they hate being called stores.Correct, it is the 'bomb store'
What you called the fusing building is the Incendiary & Pyro store.
(fusing buildings were drive through and I don't recall any surviving at Wendling - they were along the track between the peritrack and the store area not in the main wooded area).
There are several small Incendiary store buildings, SAA stores, component stres, smoke bomb stores otted arond the bomb store area and to generally daily similar plane designs.