This site was taken down by a hacker in 2018 and I haven’t had a chance to get it back up yet… There’s a blog post that contains a bit of the former information on building your own over at http://www.slowhandfarm.com/2019/02/19/farm-hand-carts/.
You might also be able to find some of the old info on one of the internet’s archiving machines that shows websites in their old forms – shoot for early 2018.
The rest of what you see here is WordPress template stuff I’m not even going to bother editing (it’s taken me a year just to get this little bit up). I do hope to get everything back up and running soon (like maybe by 2050?)