Is the manor open to all for photographs and walk throughs? More information on it please.

Parts of the inside manor and all of the outside you can take photo's.

Yes.

I live right around the corner from it. You can go in the mansion as long as its not rented out to a wedding party. We shot a music video right on the front lawn and never got kicked out (the ranger office is right next door) so I would say you are allowed to take pictures without a permit