Route From Nong Khae To Lopburi Via Phachi?

wondering if anyone has done a ride to lopburi from nong khae via phachi? i have a basic route:

http://goo.gl/maps/YIlE

but wondering about the state of these roads for a road bike. way back in 2008 i tried nong khae to phachi more or less along the same route but gave up as the road was in a sorry state.

any advice appreciated.

thanks.