That looks pretty good. The route to Abergavenny is one I've used quite often when riding to Mid-Wales.
Not sure what's going on with the route map on their site though - it does something odd after Monmouth. The A466 between Monmouth and Chepstow is busy, but not too bad to ride on.
Yup - it went on to a public farm track for about 5km, through fields, over a stream. Was lovely although in anything other than bone dry conditions i reckon you would need 30mm+
Did this today and it was lovely:
http://lesportif.cc/rides/basic-hilly-160km-100-miles-from-bristol