So I've sweated copper a few times and not paying top dollar to have it done. To minimize down time I'm considering doing a lot under the house before tying into the riser out front and water heater. Also I'm using 3/4" with 3/4x 3/4 x3/4 tees for takeoffs to 2 separate bathrooms and a line for a future Tankless? Does this seem like a good system I planned? Some copper is under the house already but my water pressure is about 45lbs at the front spicot downstream of an old gate valve on galvenized riser...The whole horizontal run under the house from the riser is galvenized😞. Space is limited so I'm going to tackle this in phases. A little one day and so on. I plan on ball valves at each 3/4 takeoff so I can get the water back on once 1 bathroom is back up. Eventually I will do the hot as well and heard 1/2" from the water heater is all that's necessary? Does that seem right? Hopefully I'm not buying off more than I can chew...The line from the meter to the riser appears to be PVC. Any suggestions or tips are greatly appreciated.!!