Actually, its a 3' tall by 1' diameter canister with a molded bottom much like a liter soda bottle and that's the part that's giving me fits. Below is the best I've been able to come up with which I did with just some simple cuts and fillets. Anyone have a better idea how to go about it?

Try this. I don't remember where I got this model, but I think it's what you are looking for.