Tankless install and re-route fixture supply lines
I am in the planning/prep stages of converting from a tank to tankless water heater. The new unit will be wall-mounted just to the right and below the capped-off copper trap in the picture. I plan on extending the 3/4" lines at the top center over to that area for hot and cold connections (blue and red lines starting from top center).
I'd also like to move the existing fixture supplies over to that new section of trunk (i.e. closer to the outside wall, new lines in blue and red. Lines to be removed in black). Will moving the branching points over there impact impact flow much vs where they are now? I'd like the middle of the room to have a few joints and valves as possible for when I put in some finished spaces later.
FYI, I'm in Atlanta (temperate) and I'll be blocking and sealing the rim joists with foam at the same time, along with installing a new frost-free sillcock. So..minimal freeze consideration necessary.
Is my reasoning sound here? Are there any gotchas with pipe and shutoff placement that I need to consider?