I got the heavier sink from Lowe's, but discarded the legs and built a plywood boxk and build it into my bench.
The laundry room was on the back side of my cubbie at the front of my garage as well. I added a water softener in the laundry room that taps off the supply for the water heater, then returns, there is also a bypass valve.
These lines run over to the cubby area.
They are the lines marked 'IN' and 'OUT' in the upper left hand corner. The wall box they go to is just for the softener.
While I realize that the drain line is not vented, it's worked fine since 1998, (the builder didn't put a vent in my hall bathroom, THAT, I'm going to have to fix to keep the tub from gurgling, didn't happen until the new toilet.) My washing machine is a front loader so it doesn't use as much water anyway.
You can see the new tap off the drain line to the shop sink. The milky PEX off to the left is to an outside wall with a wall hydrant. The water comes from the tee in the wall just above the drain line, I put new 1/4 turn valves in my old wall box to replace the old ones, the bottom lines under the drain pipe are for the shop sink. Everything got reinsulated and new drywall. The sink has angled shutoff valves above the sink with white plastic feed lines to the wallmount faucet that has top feeds. The tee at the far right lower is to a wall mounted hose bibb.
And no, it's not a load bearing wall, I have full trusses in the original part of the single story house and that wall is perpendicular to them. The addition that I built has a stick framed roof.
My garage is also fully insulated (why the builder would insulate the garage, but not put vent lines in is beyond me), and I've never had the temp in there below probably 45-50 as the central air unit is in the same garage accessed closet as the water heater.
BTW, the area I live in there are no permits, inspections or anything, which might explain it a little.