You don't need to build the ring box for the trap - I did because Sonny and Mel do that and it provides a pretty easy place not only for the SHB trap but also to do winter feeding via baggie and I needed something like that -
obviously from the video I didn't make the ring an exact fit since it wobbles in its place, but hey, that's what happens when you didn't get to take shop (when I was in school, girls took home ec :-D)
Sonny and Mel did say that you could just put it on the inner cover - I see most of the SHBs on the inner cover usually on the hive side of the inner cover, though. Or you could leave the inner cover off and put it on top of the frames and then put on the telescoping cover....
I usually try to do it the recommended way first before I make changes, so I followed their "recipe" (to bring my home ec into it!)
Linda T in Atlanta