Bob, my circumstances are different to yours as degenerative Neurology drove me from work before 55, my advice, however, is consistent with your circumstances.
Bob, you are truly blessed in having Astronomy as a passion. I guarantee you that never a dull moment will conspire against with Astronomy as your companion. Further.... your Astro plans/designs are about to get more complex and more engaging than you ever thought possible.
Nb: If you don't have the following, then purchase them quickly.... A metal lathe, a mill, an excellent collection of vices & clamps, and if you haven't already purchased an Arduino starter kit + stepper motors and encoders!
Fair sailing & clear skies
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