Update on the single-speed...
I finally got my single-speed wheel from Peter. It was basically a stock Quando hub fitted with a solid axle and some nice track nuts. I swapped-out the BMX cog and custom spacers that Peter installed with the better quality cog/spacers I purchased from Endlessbikes. I also installed a On-one brand chaintug, and readjusted the cones prior so that a bit more of the axle protruded out the drive-side (to accomodate the slightly higher stack height with the chaintug).
More pics on Velospace (click my sig).