This is my 1x10 Gravel bike. Campagnolo 135bcd crank limits me to a minimum of 40t on the narrow wide chainring. If you zoom in, you'll also notice one of those chain minders from eBay.
That's an 11-42 cassette with a Shadow SLX derailleur. I use Microshift mountain pull thumb shifters.
I would suggest something indexed. I use the bike in a lot of mountain bike situations. There simply isn't enough time fiddle with gears, you need more precision in a hurry. Friction would probably be fine for 10 speed on the road.
With the 38mm tires, I do get some toe rub. I don't get any with 30s. So keep that in mind. I've managed a ton of very serious miles on this one, it's definitely the most trustworthy bike .
I have.
Message me if you have any questions. I built mine from the bare frame, so I have some insight in this.