Mark G. is the only person that comes to mind. You would end up having "X" amount of loot just in the rail work. I don't deal with him or know what his prices would be. He is one of the best at rail work.
I have a 9' Centennial Snooker that I been considering the same option. The rails are in great condition and being they are Brazilian Rosewood, it has crossed my mind to ask Jack Z. if he would consider the rail rebuild. I know the castings are smaller, but, via this forum I read somewhere that they also can be used. I thought the castings had to be swapped out, which is not a biggie: I have plenty of extra parts.
If you got the table really cheap, it might be something worth looking into. Is it a 9' or 10'?? People have practically tried to give me 10' snooker annys before and I won't take them because no one wants a 10' table. Food for thought though.
TFT