The drill bit is on the outside of the wall cavity. Right photo is in the basement. Left photo is above. The whole mess ends up in an upstairs closet{top right picture}. From this location, I'm thinking I can run it along the floor into a room and them build a false floor on the top of it. Is this possible? or am I nuts. I have a heating air guy coming over tuesday. He already told me where to cut some holes so he can run a return air duct up there. He wasn't real hip on the idea of running duct up there because there just isn't much to work with as far as accsess. I think the false floor idea would solve the accsess issue.