I don't think I will get enough heat from the engine for good heat, I will try it first and see. If not I might look at 12 volt or colent heaters.
UPDATE
I got my cab done. I took it to the body shop for a paint job. He called last night, so I took the tractor and we put it on with 4 bolts, all the adhive back foam was in place, it sure looks good. Well they were claiming a snow so I hooked up the lights and flashers so I could go at 4:00 AM. we got 2". I got done by 2:00. Man it was cold. I got the glass today when I got home. A man will be here tomorrow AM to glue the glass in. You should have seen all the funny looks I got! New cab NO GLASS. Well it should be winter ready by the next snow.
I will post the finished pic's when it's complete.