Need a little help (or a lot) with piping layout on this boiler install

We are finally getting the New Yorker I pulled out of my basement installed in my friends house and we have a few questions on layout. Some pictures attached. Obviously this is not going to be a modern & clean install but we want to do the best we can. The return would seem to be pretty straight forward. But it's getting it all squeezed in on the feed side that could be tough. My first question is that red B&H thingy. What I remember is that it's to provide a break in circulation when the pump is not running, just for the normal rise and fall of heated and cooling water. The one in my basement only has two large ports and is inline after the pump. It looks like this also had the fresh water fill coming into the back of it?? Tentative plan is to go up up from the boiler feed directly into the bottom of that B&H piece, using the B&H piece to turn things 90d and give us the fresh water feed out the back. Then directly out of that into the expansion tank. Then turn 90d back towards and into the feed pipes you see with the gate valves on them, sticking the circ pump there. Assuming that is an allowed setup I think everything would just fit reasonably tidy without going off in strange directions. Domestic hot water I'm comfortable with. I now what's need there. Also the pictures show two zone valves but they are going away. It never really made sense to zone it off as the house is so small and a recent renovation means it's quite well insulated for an old concrete and block house.