Osher, Humbrol 93 or Revell 16 would be a good start. After a wash and a drybrush, it won't matter much anymore. But 99 and 154 are definitely not 'ochre' enough.
Having said that, now that you only have 3hrs and 30mins to complete the tractor, it might not matter anyway either! Just kidding!
Lodni, hope everything is going well for you. By the time I start, you should be really well into it!
Thanks for the update, Dawn razor. I'll update the records accordingly!
Dan, wishing you luck with both the Komet and the other half!
I'm gonna take a short nap before getting started!