[Jon Skagfeld]

Appears that you have a later production of the case, with web handle straps. Originally, I believe the straps were roped.

Looking at the case, with the lid up and away from you:

Far right, side closest to you...slot is for spare magazine.

Centre, side away from you...fitments for containing the spare barrel.

Side closest to you, just under the front lip...fitment for wooden swabbing stick.

Far left of case, at bottom...two drilled holes. The one with a wooden keeper is for a spare gas plug, the other one's purpose escapes me right now, but I think I've got reference material for it.

Just to the right of the above, still at floor level, bevelled cut-out area was for the Lensatic Sight, used only on the Mk 1, but still retained for Mk11,etc, use.

On inside of lid, holes in both padded "holding gun in place thingies", and two leather straps contained a metal cleaning rod.

BTW, this item is/was commonly referred to as a Chest.

How's this for starters?

Regards from an ol' Bren gunner.