Pol, that whole story is really cool and eerily familiar. My grandfather, too, was a "flying farmer". He grew up watching the mail planes fly over and said the same thing your grandfather did, "some day that will be me." He saved up silver dollars and bought his first plane in the late 40s/early 50s. He had his own air strip on his farm and flew into the mid 70s. Then quit on account of Nana's worrying.
He's part of the reason I love flying and why I became an aircraft mechanic in the Marines. He's still alive... going on 86 now.
Anyway, I really hope you someday get that plane.