Powervent oil burner and connect Englander add-on to masonry chimney?

I installed my Englander furnace about six years ago and put up a brand new Class A stainless chimney. I've never really been crazy about how it looks, or the fact that I have two chimneys on the side of the house. It just looks awkward. The furnace sits right next to the oil burner. We are looking at a potential major renovation of our house this summer, and part of that renovation will be moving all of the ductwork to the attic via a chase through the first floor. The reason for this is because the previous owner butchered the original system in order to accommodate a finished basement. It is horribly inefficient in terms of air flow. In any event, the entire HVAC system is going to torn apart anyway, so if there's going to be a time to make a change, it's then. Here's the plan:

Move the wood furnace to the opposite side of the oil burner from where it is now, which will locate it right under the (clay lined) masonry flue. Routing the hot air delivery plenum will be just as easy as before. The oil burner could then be powervented through where the Class A chimney exits now. Then I'll have one chimney that I can then really insulate well as we'll be applying foam board to the entire exterior and residing during the renovation. That said, I have no experience with powervents. I'm pretty sure one of my neighbors must have one because their house has no masonry chimney at all nor any tell tale galvanized pipes sticking out of the roof. With regard to the existing Class A I'll hold onto it as I'll either use it for a small stove in an outbuilding, or possibly a stove for the living room down the road.