As above, I used the superstar singlespeed kit (wide cog) as the Hope body is quite soft and narrow pressed cogs can cut into them quite badly. The wide cog version is only a few £ more so worth it IMHO.
If you want a single speed specific chainring look at the FSA DH 3mm rings. Only around £14-15 from CRC and been great so far. Much cheaper than Velosolo and not much more than a thinner, ramped Deore ring.
PC-1 chain is a good choice but I got the nickel plated version – have heard a few things about the non-plated one not lasting well.
Cant help with tensioners unfortunately – horizontal dropouts here.