Thanks for the compliments on my restorations cubkenny...I appreciate it very much!
Regarding those stubborn spindle nuts...my next course of action would be to try an impact wrench on them, with a large wrench on the opposite side of the spindles. If that doesn't work, try heating the nuts (not the threaded part) with a torch. Heating will expand the nuts slightly making them easier to remove with the impact tool.
If your deck is in really bad shape, try to find a 48GT or a 54GT deck for your tractor. Part of the fun restoring these old (but really well built) tractors is the hunt for the things you will need to get the restoration completed! You will meet many nice people along the way as you search.
Check craigslist, auctions, cub cadet dealers who sell used equipment as well as any other sellers of used garden tractors in your area. Also, try cub cadet enthusiasts who have things to sell. Have fun in the process!
I look forward to seeing your restoration pictures as you progress. You are off to a great start! Keep the momentum going!!