Very nice install. Beautiful work. A few details I might add... Have three screws on each stove pipe joint instead of two. It makes them much more rigid & is recommended. I'd put caps on the boiler drains. That type of drain is sweet, but if accidently kicked will open. The caps are hard to find sometimes. If you really really want them & can't find them, PM me, I can get them & drop them in the mail. Level the damper. Maybe it's an illusion, but it is important that the hinge pins be level. Again, a very pretty job, you did well!
Oh, and using a flashlight housing as a second supply pipe, very McGiver of you.