Although my son does not have a 'stash', he has a very strong interest in things like yours. I was told that G&T kids love things used for measurement e.g. calendars, clocks, compasses, and others like gears, blocks, rubik cube, etc. He is 7 now and has moved on to more abstract thinking and calculating. I read your posts here and I was in the same place although I sent my son to a Montessori school at age 2 for 1/2 day. He went for full day at age 3. I still had to keep him stimulated or have toys available that interested him when he was home. It is exhausting work. Is he reading yet? I wonder how far out you are 'in a rural area' and how far are you from the nearest city. How much time does your son get to spend with kids like himself? This is very important. I look forward to hearing back from you!