SEO Needed for Mesothelioma Keyword for Law Firm site

Hi I have one client, that has a new site, the domain is a .com [login to view URL] <--- is the clients site Keyword: Mesothelioma I have a agreement with this large scale law firm that, they will not pay my company until we get the keyword on page one. So do not ask for money upfront. Do not ask me to escrow, and tie up my own personal money because will not do that too. One thing I can say is I can pay you on Gaf a 20% deposit after you get the keyword / site ranked in the TOP 20 pages of google, then 20% more once you get it to top 5 pages, then last 60% when it hits page one. As Client will not pay until some or all the keywords hit page one of google, So i would pay you out of my own personal pocket as we go, but will not pay a single penny until you get it to top 20 pages on google for the given keyword. please make your bid, and if its fair then you will win, please tell us your time frame as well. thank you