Hi Gary -
The others have answered your ToT questions but I'm just curious if you're considering building a scenario of your own? If so, I'm happy to help you knock off some rust from your "sabbatical"
You should definitely check out the scenarios that released in 2018 and bookmark the Scenario League wiki if you haven't already:
http://sleague.civfanatics.com/index.php?title=Main_Page
Of the four scenarios released last year, 3/4 feature Lua.
@techumseh 's excellent Operation Seelowe is a "traditional" scenario but probably about the pinnacle of what one can do with them. It is absolutely excellent and you should check it out, especially if you like WW2 scenarios.
As for Over the Reich - Prof. Garfield and I have been making massive modifications to it and plan to release the new version hopefully this month. You can still download the old version and poke around, but the new one has major changes. It is multiplayer only but if you can find someone to play it with you I think you'd enjoy it. In any event, it is must-viewing for anyone who wants to know just how powerful lua events are.
Here's a link to my YouTube channel that has a number of videos showing off what is achievable with lua programming (as opposed to the base game's macro.txt events).
https://www.youtube.com/channel/UC1B0Bz7nMOXGsNHpWACzT_A?view_as=subscriber
One thing I would caution you on:
When you get the game in the mail, before you install ToTPP, make a copy of the ToT folder and preserve one as a "base game" and the other for ToTPP as some people have reported some issues with playing older scenarios on the new ToTPP platform.