As a thought, and this will depend upon your budget, perhaps you could pick up a cheapish second hand refractor and involve your son in the building of a dobsonian mount for it. Should he still be keen then you can move on to constructing your own Newtonian (or whatever) in due course.
If you are clever enough with woodworking (which I am most definitely not) you could probably design the first mount in such a manner as to accommodate the possibility of the Newtonian project coming to fruition.
Whatever; any time spent with your son is precious and something to be treasured, Randall (as though you didn't know). My own son has just spent a couple of weeks in Tasmania - he should right at this moment be on board for the return trip - where my wife and I spent our honeymoon so many, many, years ago, and I'm really looking forward to him popping in to show us his photographs and relate his tales of derring-do.
I'm lucky in that my son is also a friend (if you know what I mean) and we have a number of common interests. Whatever you decide upon, Randall, I wish both you and your son well.
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