That's handy Bob. My wooden windows could all do with a coat or two of weathershield. Like all the best hobbies you can fit it in around other fun events like 'family'and 'working'.I quite fancy painting
One other idea I just had that might suit you to try is archery. I enjoyed it for a while before kids etc got in the way. You could pick some gear up second hand like a cheap bow and target.
You have the space already and if you like it and get better and need a challenge in the future you could always a "Free Small Dog Daycare" events at your Mrs' hound pound. Just get the waiver notes written up by a good solicitor.