I don't think anyone is surprised with the possibility of how this may turn out. While some mentioned earlier that you should consider trading it in for a new tractor it did not seem like something you were willing / able to consider based on a comment you made regarding not having the money to get yourself out of it.
At the end of the day asking for an estimate on the difference between the depreciated value of your tractor and a new one is good advice, if for no other reason than to put the issue to rest. It may be something you decide is achievable or, for whatever reason, is not. At least then you will be able to focus your energy on seeing this through.
Like Ray, having worked in my father's auto body repair shop while living at home, I would have likely opted to complete the repairs myself. I understand you haven't the experience to do something like that and I disagree that you can never bring something back to its original state. What is required is the expertise and diligence to do it.
My opinion, I think that is what is lacking here. As per my previous post, the apparent alignment issues you described should have easily been remedied by an experienced technician. Experience, desire, pride in workmansip and work ethic seem lacking in this case. Prior to meeting with the dealer, meet with your agent and express your concerns with the state of the tractor during your first visit and what you strongly believe are issues that will make the possibility of ever being satisfied / confident that the tractor has been restored to its original state impossible.
If the dealer has any kind of sand, he will ackowledge whether his staff have the experience and skill to make the necessary reparations. At the very least having you acknowledge your concern with both the dealer and rep is important.