Very nice stand! That is a huge wind block for the burner. Did you roll that or have it cut from a pcs of pipe? You could almost cut that in thirds for two other burners. I would be interested in learning how brew day goes with one burner and no HLT. I might try something like that with my...
I would vote for brew stand #3 as this is the one I built. It is the most compact, designed for one pump but you can easily brew without one and transfer by hand. You can gravity feed into the BK and do decoction mashing very easy (gravity drain wort into boil kettle, heat and recirculate)...