Hi Stretton, the cracks in the green frame were about identical to the cracks in mine before I partially restored it. I straightened the metal to its original position then simply welded plates to the underside of the larger cracks and welded over the top of the smaller cracks, underneath also. Worked for me. I believe cracking along those rails were a common problem with Scotty's. My before and after pics attached (and a piccy of my lawn)
Cheers Ross