I built a pair and finished them this summer. Love 'em.
They took a lot longer to build than I had anticipated. Especially the cabinet finish (mostly painted / Duratex in my case). And I primed the insides. My soldering skills were pretty rusty too, so I felt like I had to relearn that. I also built a set of GR Research cables during that process, which took waaaay longer than I thought they would. I also updated some speaker stands that I built many years ago (made new tops to match the speakers and repainted).
If you plan on using Duratex, Parts Express carries a small can of it now (about $26).
Note that after you have 3 (?) posts you can do a search here. There are many really good threads about these speakers. You'll be amazed at some of the finishes that people do, if you haven't seen those already.
Good luck, have fun and welcome to the AC.