Good luck, and please keep us posted on your success!

I don't have the time to invest. But I wanted to say this -- to a programmer, someone saying the MVP is "50-75% done" really sounds like, "you are going to do way more work than you think. And we will think you only did 25-50% of the work, so you will get screwed on equity."

All programmers are bad at project estimation. Asserting that you are that far along sounds like you're starting the negotiations with, "we have done over half the work, so don't expect tons of equity."

Just my thoughts. Best of luck to you guys.