To make a simple and cost effective canister throne, schedule 40 PVC pipe, cut 2 3/4" pieces of plywood. One that fits inside the tube for the bottom and one that fits the outside diameter of the tube. You will have to cut a third that fits the inside diameter for the seat to rest on or three blocks works well too.
Just use 2" foam and vinyl/Naugahyde of your choice and staple it to the wood going over the foam. The originals had three latches on them, you can use just two but I would use three. If you need closeup shots of the latches, I can take some pics for you. Two just mesh and one is a real latch.
I would definitely do BOP on the Down Beat kit... I read where you have an original but..... I would check everywhere for Mod Orange wrap. Or Precision does the printed wrap... Top Hat & Cane would be very cool.
The Clubdates.... probably silver sparkle.
Look in the gallery and you will see the Down Beat kit I wrapped in Red Sparkle, that will give you a good idea of what they will look like.