if you can give links to the orignal unedited picture even better if their shot in raw, im someone here can do you very good panaromic shot. but what you given is limiting to what can be done.
Can i give you the full size picture using my Photobucket link?
I think i've done itThe picture is massive!
Do you have the photos separately, like others say, it will make for a better finished job if you have, as at the moment it means playing with perspective etc to try and flatten the image, whereas the individual photos should be straighter already