Oblivion had a cut questline where you could rebuild Kvatch and become it's ruler, and mods re-created that that later. So... Helgen Rebuilt mod, anyone?

If I were more talented and more familiar with the Creation Kit, the one thing I'd do is make a mod where the Dragonborn rebuilds Helgen, and becomes the ruler thereof. Of course, I'd also try to expand that into a third faction in the Civil War, and do my best to make the Dragonborn the High King. It would have to be epic, lengthy, difficult and deadly. Everyone would be an enemy, unless you could convince various Jarls to side with you (good luck), get guilds on your side, etc.
Daunting task, just rebuilding Helgen

The rest is, I'm afraid, a pipe dream.