RE: extensions
If you're going to use it as a "daily driver," they'll (Ohio BMV), will require commercial plates. Those are around $135.00 per year. If you want it for parades, personal enjoyment and functions, then get the "Historical" plates. The one-time fee of about $45.00 is good for 50 years, unless you get personalized plates. Personalized will cost you $35.00 per year.
ALSO! Ohio will want a title!!! GL doesn't give you the form needed, so they will "create" a title from another state. In my case, they created a Florida title. Once I had that, I went down for a quick, "out-of-state" inspection, and I was rolling. Not all that bad.