I just built a new 26" muni so I can help out a bit, if not alot.
I would stick with the KH isis hub and crankset, it seems to be the most compatible of all the hubs out there at the moment (hehe I made a joke).
For the rim, it really depends on your style of riding, and your terrain around you. I got a Sun Rhynolyte rim, its pretty thin, infact I think its more thin than the DX32 but its strong and pretty perfect for almost all riding.
The big defining thing when choosing a rim is the tire that is to be used on it, and the big defining thing for that is the type of terrain that you will be riding. A 26er is more of an XC machine for most people and even if your cross country riding gets pretty hardcore its still no downhill freeride.
I currently have a 2.3 inch tire on my 26er and its a true 2.3 which means its a bit smaller than my trials tire and actualy for some reason a bit larger than the 2.6 inch tire on the DX 24".
For most 26er riding I would recomend a 2.3-2.6 inch tire, a 3 inch tire or around there is pretty pointless unless you are doing some of the crazy california stuff that some people are doing. That being said, it does add some impact absorption into your riding and will give you more control on snow, super loose gravel, sand and deep mud, but it will also be very heavy and since its so wide it will slow you down alot. A smaller tire will be faster and lighter and still be able to get you through almost any terrain including gravel, packed snow, and light mud. I would really stay away from the fat tires on hardpack and paved stuff though, even most singletrack is better suited to a trials sized tire.
After that little article on tires I would recomend not going larger than a DX32, its certainly big enough for almost any riding you will likely give it.
Also are you going to be getting any brakes on your beast?
I’m just curious, I’m putting some v-brakes onto mine to get some modulation due to short cranks, but I’m curious to see what other people who ride 26ers do.