Hey danwood, I was going to get all fancy with my rig like yours, but ended up going with this. It's a 98L 'ex' BIAB rig that now uses a decommissioned 50L keg as the 'bag'. The keg can hold over 20kg of cracked grain with some persuasion
I have a craftbrewer green pump and it has just enough enough grunt to recirculate nicely through the copper manifold and the cuts on the top of the keg...mind you it is also pushing the wort though a 3m hex coil so a lbp may be ok
one thing - make sure that you are able to hoist the basket out, because 20kg of wet grains weigh a bit more than 20kg of them dry
what batch size/s are you looking at doing?
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