Oh, I don't think this would be difficult at all. I think the hardest part would be mitering those tiles perfect like that. I'd probably try squaring them instead. If you glue the tiles tightly together, it doesn't even look like you'd need to grout it. If it were me, I'd start with a sheet of plywood cut to the ultimate size of your mirror (including the tile border). Have a glass shop make a beveled mirror to the size you want. Or if cheaper, find the mirror first then cut the plywood to the size of the mirror plus the border. You want at least 1/2" plywood to be sturdy enough. Glue the mirror to the center of the plywood, then glue the tiles around it. Just make sure if you do end up grouting it, you tape off the mirror to avoid scratching.

When I find something that works I stick with it. I have living issues specific to me- enormous dogs that factor into every decision- the placement of every table (tails!), the width of passageways (stepping over sleeping giants), upholstery materials (200 lbs. of toenails do a number on bad leather!), the height at which things like televisions and shelving are placed (HIGH- these beasts can grab stuff off the top of the refrigerator, and open it, too), flooring- everything. I have spent decades fine tuning these issues and finding solutions to living with multiple Yeti and still having an attractive home that works at least equally well for humans. Of course when I moved the new place had the same concerns so I duplicated as many of my solutions as I could. So yes, it is much the same right down to the layout. Although I have been chasing Ben Cartwright's living room at the Ponderosa Ranch since I had a dollar to began decorating. That space, to me, represents the ultimate in durability and comfort. I need tables you can tap dance on in hobnailed boots and scrubbable furnishings, lol, and I got 'em. My furniture is nigh indestructible, suits my needs, and looks good- I chose well. You can walk in the door not even knowing Yeti live here and it looks good, so win/win. For me what works in the first house works in the second and third just as well. It's not a rut, it's a groove!!

This might be pretty for the sink. https://m.dhgate.com/product/8-inch-widespread-lavatory-faucet-brushed/423358048.html#pd-019

Where I live there is the ever present threat of forest fires so real cedar shingles are not allowed ,but I have seem the imitaion ones and they look very real.Sorry not sure of the company but the ones above look pretty good.