I don't have any pics of my Peugeot two-speed (yet)...sorry! It's a road bike so I don't really know how a two-speed mtn bike does off road.
Anyway, I'm actually not using a Singlator but a late '80s Campy C-Record rear derailler somebody gave me and an old Dura-Ace ft. changer and a Shimano stem shifter with the right shifter taken off. They're much lighter than the low-end Simplex stuff that was on it. I wasn't aware that the Singlator only had a four-tooth spread.
I already have a fixed -gear and I'm building a SS bike so having a two-speed is just more variety for me!