These are great, awesome work. It's a pity there's not enough numbers for it. Still, even at $15 it's too rich for those that don't live in the USA - much the same way the Southtown Shockboxes are too expensive when you ship them out of the USA even at the cheapest option -18 in one box. It equates to AU $25-30 delivered each with an insert depending on the exchange rate. So perhaps AU $35+ each to get one to Aus? In comparison I've picked up lots of carts here for under that price.
All that said I would love 60 of them. Great work - you're super talented but I doubt I could ever afford them even if you did get it up n running. Best of luck!