By definition, the oil in frame models need to be very clean for obvious reasons, but you'll find most of the crud will you've missed will drop into the sump so you can take off the base plate after a few miles and clean it out. Make sure the oil feed pipework isn't blocked and fit a decent filter if you've not done so already.

Other areas to ensure are grit free are the swinging arm and front fork pivots.

You said it had been sprayed rather than powder coated but you may still find that the swinging arm and rear shock bushes will not fit now so be prepared to maybe do some filing away of your shiny new coat in places!

Good luck!
Rudi