I actually have Fahey guitar tab and play a few songs on guitar. I have made several attempts to arrange Fahey songs on uke but they never come out sounding anything like the original. They all have a very big tonal range and the thundering bass and tinkling treble together are sort of the whole point.
Incidently, I also play Aaron Keim's Sunflower Blues, which is a very nice song, but I think it sounds nothing like the Fahey version, indicating his stuff is pretty hard to replicate on the uke.