This is how I imagine it... a central wooden dowel attached to the base. PVC piping cut that the angle of your tilt slipped over the dowel... a wooden circle with a hole drilled in it that is not bigger than teh diameter of the PVC pipe so it won't slip down to support the tilted tier... another piece of PVC slipped over the dowel cut at the same angle to keep the board in place and provide the angle for the next floating tilted tier.... and so on until you are done.
You would have to drill your holes in the wodden cake boards at the right angle too or they won't sit tilted... maybe if you made it a little bigger than the width of the wooden dowel though it would be able to sit crooked without the angle.
