Just made a couple of alcohol stoves this morning, I've been meaning to try one for ages too.
I use two coke canes and ended up with something around 50mm high. I remembered something I read on the Zen site about using an unopened can to make the bottom part open up a touch, it worked a treat on my second attempt. The first one split as I pushed it down, with second one I gave it a bit of veg oil and it went on much easier.
I don't have any of that ally tape yet but I still tried it out in the garden. I half filled it with meths and popped it in a hobbo to act as a windbreak, sparked it up and then popped my mug on. It took about seven minutes to get a rolling boil, I ran in the house and made our lass a brew , back outside with another mug full and boiled that up in the same time. I left it to burn out to see how long it would run for, it took half an hour from lighting so I'm dead pleased with that.
Gonna make some more now