Blenheim MkIf Gun Pack - a Challenge!!!

[buffnut453]

I've aleady posted this on Hyperscale and Britmodeller without success, so I thought I'd try this august group of experts. I'm trying to find details on the gun pack for the Blenheim, starting with the following initial questions:

1. How was the gun pack fitted to the fuselage?

2. How was ammunition fed to the guns?

3. Where can I find a photo or diagram showing the internal arrangement of the gun pack?

I've checked Graham Warner's definitive history of the Blenheim, as well as the Crowood and Osprey titles but can't find these important (to me, at least!) details in any of them.

Can anyone help with my sad, obsessive vendetta?

Many thanks in advance,
Mark H (LKBS)