Conclusion
This carrier has been fitted for use as a 3" Mortar Carrier, obviously prior to production of the purpose built carrier. You can clearly see in this shot, the armoured radio cover ( and how it interferes with the tool stowage )
My thought now is that the brackets in question are for the stowage of the mortar base plate when not in use. The bracket in 2802 has a swivelling clamp on the top of the wall, visible in the picture; which appears to have been present, but lost from your carrier.
I also believe that the loop straps that cover both interior side walls may have been for stowage of mortar bombs.
My appologies for not being able to remember the source of this picture to credit it.
Pedr
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