Hi xhall,
I'm not sure why you would want to go with powder coating as this topic has been discussed many times over on the ODK Forums and there is conclusive proof that it's not good on lawn mowers due to its hygroscopic properties which induces rust and that's why all the Rover made units suffer from massive corrosion so predominantly. Actually look at most lawnmowers of today that have steel bases and you'll see that most turn into rust buckets very soon after being put into service. All of them are powder coated due to ease of production and no other reason.
Cheers,
BB