Self funded search economics?

I am a solo search funder writing my investment thesis. I would like some help to propose defensible economics to my investors. I seek between 50% - 70% ownership at exit. However, I am not clear how to structure that offer at Entry. The rest of my funding will be 50-60% debt, maximum 10% selling financing, Equity 30%-40%. I need some help to understand what could be acceptable based on real life experience and what type of trade offs, incentives, strategies I could use to get there. Thank you so much.