I am going to play around a bit with a center column of PVC. The basic idea is to cut a large slot or slots in the top portion of the pipe and use a coupler to attach it. It makes the build a little more simple, and I already have all the PVC from another project. To see how well it works, I will compare the performance to the Oneida Dust Deputy which I've been pretty happy with. I plan on keeping the other aspects of the design the same.