Their is no specific build doc for the 26650. (I know, I need to put one together or maybe just update the Peko build doc). But it really is a very similar build. It just has the addition of two extra solder lugs and two sets of small screw/nuts. Here are two pictures of what the hardware set-up looks like. I think I posted these earlier, but things do get lost in threads. Actually, come to think of it, I'll make an additional section to the Peko Build Doc and put these in it with some descriptions tonight. My 26650 is out getting cerakote so it may be another couple of days before I can do the build. Hope these help.
It may be difficult to see, but all of the small nuts should be on the lower side. Also notice how the solder lugs overlap on another.