When the day comes that you die and look back on the life you've lived it's the memories you will cherish, not the money. I'd say only make the switch if you need the money to continue to do good by your life, or if you feel the project has potential to bring positivity to the world (Manufacturing Nukes vs Creating a new AIDS medicine). As you said you could work and retire early to get back to where you are now, that's to say you would want to eventually be back where you are now, perhaps with the new money you could get your own thing going... I know Im probably not helping much, but I'm trying to think of all the angles. I say go for it if you are on board philosophically with what they are doing. You know you enjoy what you are doing now, and if you truly feel you can get back into that industry when the project is finished then it seems like a low risk situation. That being said if you are truly content in your current situation then continue to do what you enjoy. It does sound like an interesting proposition to me though. Best of luck in your decision Further. While I haven't met you I get the sense youve got a good grasp on the importance in life. I hope things work out well for you whichever decision you go with.
Dilemma over I'm staying put. I think I would have made that decision regardless, but I also found out my chances of getting the job weren't quite as high as I was led to believe. Regardless, I was already getting sad at just the thought of changing courses right now. Tomorrow I'll be outside in an overgrown Sangiovese vineyard trying to bring it back into production. It will be hard work in cold ass weather but I'll be happy the whole time.