Running water pipes:
If you have a concrete floor you are forced to use the existing risers coming up into the wall cavity. You will by now have all of the timber in for your new wingbacks and have these positions marked H and C on their respective centers on this timber ready for each new fixture at the time of fit off.
Begin with the cold feed line you are going to use and if necessary block off other existing risers if they are not going to be used. As it is easier to make new branches with poly tees.
All of the cold lines can be in ½-inch (15 mm) diameter bore size. But if there is an inch (20 mm) line available off the hot already then use this main hot feed to begin the running of your new plumbing water lines in hot. If this is not possible especially if the hot is street pressure running all lines in ½-inch (15 mm) is fine.
If you cannot get under the floor you will either have to cut access holes in the wooden floor and take the new pipes down up and over. Or go around the internal walls to take Dux Secura or any other type of plastic poly water pipes around two internal wall corners of the framing studs timber. Take a 1-inch (25 mm) wood drill bit and drill into the studs both sides of the corner then taking a sharp carpenters wood chisel make a notch of each of your holes to allow the recessing of the new pipes. Go in about an inch (25 mm) or more to give plenty of room for the 90-degree elbows and the pipe.
Now is the time to also drill out or check out the holes for the horizontal piping and holes through the noggins for vertical piping.
Now simply take the end of your new poly pipe and feed it in from the wingback end just letting the pipe overhang there for the moment. Or if in a tight corner position or for any other reason begin from the existing riser end instead.
It’s just a big 3-D jigsaw puzzle of different bits. The pipe cutter for small bore poly pipe is quite capable of fine-tuning the length of a pipe going into an elbow or a tee in a tight position such as an internal wall corner bend in the line or off an adaptor for galvanized (galv) or copper.