I will try this one more time so it can be seen a bit better. Attached a link to the PDF file Here is a link that might be useful: Lighting Plan

Step 1 Turn off the breaker that supplies power to the circuit. A test on the circuit will verify you turned off the right breaker. Touch one lead from the two-lead tester to the black wire inside the switch box leading back to the circuit panel. The tester will not light if you turned off the right breaker. There are two other black wires inside the switch box that lead to each light fixture; these will not have power running through them until connected to the switch Step 2 Tie the three white wires together inside the switch box, two white wires connected to the two separate lights and the white wire from the circuit panel. Twist one red wire connector clockwise onto all three white wires to tie them together. Push this set of wires to the back of the switch box. Step 3 Connect the three bare copper ground wires together from inside the switch box, the two bare copper wires that lead to the two separate lights and the bare copper wire that leads back to the circuit panel. Use an additional red wire connector on all three wires, connecting them. Push the set of bare copper wires into the switch box next to the set of white wires.Step 4 Wrap the black wire from the circuit panel around the brass screw on the right side of the double switch. Tighten the screw to hold the wire. The circuit panel black wire supplies electricity to the double switch. Step 5 Wrap one black wire from one of the light fixtures around one of the brass screws on the left side of the double switch. Wrap the remaining light fixture wire around the remaining screw on the side of the double switch. Tighten both brass screws to hold the black wires from the light fixtures to the double switch. Step 6 Install the double switch inside the switch box. Push the switch and its wires into the box, connecting the switch to the box at the top and bottom using the screws that came with the double switch. Cover the switch with a duplex cover plate and turn on the breaker to the circuit.

As long as things are simple electrically (just wires involved, no electronics) there is no reason why this shouldn't work for you. If you order this, make sure you aren't getting hit with customs fees. It is a pretty simple industrial design. I bet you could find something very similar closer (even on Houzz). But I know what it is like when you finally find that _one_ thing you've been looking for, for a very long time. It is hard to accept something less! Good luck! Joe

Thanks all or your input! I'm going with two. Two is what I originally thought but then fell in love with the PB Astor Double-Width Mirror (a 58" X 40 beveled mirror framed with beveled mitered pieces of mirror). It's the only large mirror that fit the idea I had in my head for how I pictured the space with "one large mirror", but it seems to have been discontinued on PB and there is no duplicate to be found (I even went to a glass store to see if they could make it and they cannot). So two mirrors it is. My base tile that was on backorder (giving me more time to work through all this) gets installed tomorrow so now I just have to figure out/order the lights....either overhead, or sconces that would be squeezed in. There will only be 6" of space next to the right-side mirror so I'm leaning toward overhead.