[alexqgb]

Seems like you've solved the hardest problem up front. If you had a lifestyle close to your income, and close, committed relations to people who were comfortable with that (and only that) then you'd have some serious negotiating and/or losing to do. But since you're already living economically, and have given yourself plenty of room to maneuver, I'd say you've done well.

If your startup were in the medical field (i.e. one you know well, and in which your background gives your insights the halo of serious credibility) then your positioning is even better.

And if you can get to Working Prototype before quitting your current practice entirely, you should be able to make a very solid decision.