I use a home based 1000l Ibc and it gives me great fleibility to fill up, so that's a tick.
I have two 17'gf xtel's (one a spare they are that good), so that's a tick.
I have a pump box with vari flow and 100psi pump- and a pump board with a variflow and a 100psi pump, again one's a spare. I guessing that you made your combination choice because the psi/hose lenght balance to a good flow. So I suppose I'll tick you on that one.
110 AH with split relay and Halfords charger as per Jeffs recomendation.
Facelift I haven't got but they are supposed to be the best. I have an xtel hybrid and they are cheaper.
I don't have protekacote
My RO is roman 300gpd with booster pump, to di to ibc then transfer pump onto van with no di. No complaints. I've read that merlin is the best, but aren't they mounted in the van?
These are just my choices and where I agree with you. Where I disagree that doesn't mean I am right.Also Mines a hot system.