The research prompt is done, you can now research technologies. I decided to bite the bullet and forge ahead on saving/loading games since most of the underlying data structure is already in place. The saving mechanism is now done. Next is the loading of games.
One thing that's neat about this system is that the save games are saved inside the dataset that you are using, which are copied over to your local application folder. What this means is that if you launch a mod, its save games will be separate from other mods. No worries or trying to remember which save works with which mods.
Here's a screenshot of the semi-final saving and in-game menu (I need to get a generic OK/Cancel button artworks, will commission that soon...):