An interesting OAK setup for me...comments, help?

OK...so I have a quad 5100i that I love but this year I'm installing all new windows and sealing my skylights and the place will be very air tight. That said, I no longer want to draw air from the room...I want to go OAK.

My setup is interesting. In the middle of the house lives the chimney. Directly under the chimney is a 12x6 concrete block room. Weird, but true...it is used to support the chimney (which is 30 feet high). This little block room has no door or entry other than an ash cleanout (which makes zero sense).

So this is my thought. Can I Drill down from the firebox and pipe into this concrete room using the Oak? Then drill another 4" hole somewhere else into this room, and plumb it to the outside?

See the picture I drew.

I've started the work today. I went ahead and drilled down through the floor of the fire box and low and behold it worked out really nice. I inserted a 3' long piece of 4" pipe. I also fabricated up the direct connect on the stove and will link the stove connector to my pipe using some flexible stuff. The direct connect is 59 from Quad...I went to home depot and got an outside connect and modified it...cost only $18. Worked great. Now I can run the stove by opening up the ash cleanout in the basement for now until I plumb and pipe the runner from this box to the outside. This option also leaves it open for me to come back later and pipe directly all the way to the outside if I want later if I don't the the performance I want.

I'm going to take some pictures to post on this unique setup.