Did they keep adding tires like the tiers mentioned here? I have pretty well decided to try this next spring. I'll try to remember to update this as I go along.
it seems like they did. i remember it being 4 or 5 tires tall when i saw it. that was about 35 years ago and i just remember thinking it was pretty neat. seems like there may have been an article in mother earth news or some other magazine around the same time. you might be able to google it and come up with something.