It will be constructed of:
a French Horn (horn) mouthpiece (for the widest range. Shallow-ish cup with thin walls)
Garden hose, cut to variable lengths - 9 ft, 12 ft, 20 ft, 24 ft (to give different length resonating bodies)
instrument bell- probably my favorite part. This will be made using a toilet with the cabinet either cut off or containing the coiled hose.
I'm experimenting with different lengths of hose to see if it really has an effect on the overtones I'll be able to blow. Since so much of the resonance is going to be absorbed by the material, I don't think it will matter after 12 feet, since anything over 24 could very well be unplayable
Here's the challenge: I'm trying to think of a way to string the top of the toilet bowl with 7-24 sympathetic drone strings (probably just guitar strings) tuned to the chromatic scale with a few microtonal variants thrown in there for good luck. My original thought was using the u-ring and stringing it like a lyre, but I don't know how to string a lyre. Maybe I should cement the headstock of a guitar to the u-bend and the bridge on the other side and just have 6 fully tunable strings? I don't know.
My hope is to start it this weekend and have a video made before Halloween of a full performance.