Peter, I have 14 film holders, a bellows extender thingy and what I believe is a 4x5 back for it as well, along with 4x5 film holders. The camera was checked out by someone who knew LF before she sold it and I guess he said the bellows were light-tight.
The tripod I have is for MF but can hold up to 25 lbs. I don't know if it can handle the 8x10. I guess we'll just have to see.