I know this is an old thread but here goes anyway.
Having done this for ten years as part of a welding business I used to take those old earthmover tires and etc and turn them into tire scrapers for use in feedlots and etc. First take a concrete saw and cut around the circumferance at about 20" from one sidewall while pulling the sides apart to keep the kerf open. Next take that same concrete/demo saw and cut across the bead to make two halves.
There are a few things to consider before doing this though: first: make sure you are wearing a pair of coveralls that you can throw away when you are done and a pair of Tingley rubber boots that you can just peel off and throw away. (you'll see why in a short while)
Second: when cutting use an abrasive steel or concrete saw blade, diamond wheels will just clog up and be useless. clean up of your demo saw is easily done with any kind of solvent like diesel or carb cleaner and etc however a good coating of diesel inside your cutting blade housing is recomended to minnimize you adhesion of the tire residue.
I used to make the welded frames and etc also and sold them to my customers for around 1200 to 1500 a piece depending on the size of the scraper. Now as for what to do with the left over sidewall, well I'd just give em away to the local farmers or advertise them as free for the taking for weighting down large sheets of plastic or bunker piles. even the "unusable"tires can be given away to larger dairys or anyone with forage piles for this purpose as long as you take a wire snips and trim the exposed wire.
As for the use of the skidsteer loader rubber tracks, well thats easy, use them for the pullbacks on the front of these scrapers and mount them with a row of bolts along the centerline. If done correctly a worn out track will easily become a pullback for these scrapers with very minimal effort, and also be reversable to extend the life of the pullback.
Bottom line here guys, the crescents will sell for around 300 to 500 a piece and the pullbacks made from tracks can generate about 150 to 300 a piece for a 6 to 10 foot length. take that times the number of lengths you can get from a set of tracks and you just made your down payment on the new set!
Something to think about anyway.......if anyone is interested, contact me, and I will gladly help out in any way I can.