I summitted Boundary a few days ago for my #42, and we camped at the Queens Canyon road before the 4wd portion of the road begins. But from time to time, people on this forum have asked about lodging near the trail, to minimal response. There is a camping and lodging option that i've never seen mentioned, but seems to me would be ideal. The tiny town of Benton, perhaps 45 minutes west of the trailhead, has an inn and camp with hot springs as part of the deal.
We didn't stay there, but some people we talked to in Mammoth Lakes recommended it. Fwiw, Benton also has a gas station and the looks of a charming not-quite-yet ghost town.
There also are camping opportunities on the trail itself, along the ridge and at Trail Canyon saddle, but one would have to haul up water of course.
The hike was much prettier than i had expected, with views for miles and some great bristlecone pines. And it served as a really valuable acclimation warm up hike for going up Mt. Shasta 1-1/2 days later. I salute you, Boundary Peak!