Hi Dan,
There should be at least a two step mash , 1st @ 147 °F @ say 2.865l/Kg and 2nd @ 155-6°F @ say 1.075 L/Kg , then 1st Sparge @ 170°F @1.075L/Kg / 3rd Mash Heat @ 158°F , then 2nd @ 3.685 L/Kg @165°F.
As to a water profile, a Burton profile would be good , yeast strain seems OK , I'd have...