No one has done a iron sleeve because of the cost. Here's a link to a company in Portland, Oregon that will bore your cylinder, install a sleeve and cast a liner. $55 to bore your cylinder, $175 to $275 to install the sleeve and an unknown amount to cast the sleeve. So, your looking at least $230 to $330 just for boring the cylinder and installing the sleeve. I guess you could find some one else that uses precut liners, but I doubt you'll find anyone that has precut for our 2 strokes.
If you make your own cylinder and sleeve, your way ahead of most people, especially if it doesn't cost you.
Here's some technical facts that may help:
Look forward to your progress,