I dunno, you tell me-- the idea is anybody can use gitian-builder to create trusted releases, right? Working with BlueMatt to make the nightlies use it seems like the right place to start.
I would, but currently nighties are built on a VM, and as gitian uses a VM to build deterministically, I can't run it (VM within a VM is verboten).
In any case, I will be building releases with gitian starting with 0.3.21 (and putting them on the nightlies server) if anyone wants to join and sign them as well.