The Allis G is one I also admired and wanted. My dad and I went through a tractor restoration phase about 10 years ago. We have a 1918 Fordson F (in progress), a 1927 Fordson F, a 1936 Farmall f-12 (if we get this one going we are going to name it Lazarus), a 1940 (41?) Farmall A (Restored for my son), a 1948 Gibson model D (Restored), a 1951 Allis Chalmers CA (@90%), a 1952 Massey Harris Pony (Restored), a 1953 Minneapolis Moline BG (pride and Joy, 1st restoration), a 1954 Minneapolis Moline BF (in pieces), a 1963 Farmall 140 (working garden tractor), and a 1964 Massey Ferguson 135. I restored a John Deere B for a fellow once. After that I decided I could not do work like that for anyone other than myself.
I have kind of drifted away from the farm machinery. We did the 1943 Willys MB, and a 1951 Dodge M37. I really appreciate the love that goes into such work.
I hope you get to keep the G, if for nothing else so that I can live vicariously through your experience.
I am still piddling along on that homemade 37mm ATG. It will be a while before I can focus on anything else.
Good luck!
Andy