Doug you have the almost exact setup that I'm trying to build. Very nice! You were already ahead of the game reusing probably a lot of the existing Wood boiler system. I couldn't tell from you pics your suppy and return lines. You probaby have the buried insulated 1" pex lines going from your boiler to your house. I priced 50' and it will be close to $500. Do you have any more pics of you setup (expansion tank, aquastats, valves, ect)? Thanks