Well I'll throw you a freebie :-)
Mainly cuz you said you'll design it and I can't find the time ;-) So i get a copy

The Ultimate Hitman Agency.
Players Can Create a Business(Similar to Richards Business Mod)
Upon Creation of the Business Players can Recruit "employees" into this business.
The business will be classified as a Hitman Agency.
Players can Hire whomever they choose.
A list of Current Hitman agencies will be posted up somewhere, similiar to Gangs to join.
Players Can select the Hitman Agencies and See their Rates, Logos, Banners, Company info, To decide which agency to use to complete a Hit.
They can then submit a Hit into the agency of their choosing.
The money goes into a Vault only operated by the Owner of the Agency.
Upon completion of the hit, the Owner would Pay the person who completed the hit for their agency a % amount (varies on perhaps a rate set by the owner)
A notification to the Owner of WHO completed the hit, "to avoid confusion"
Perhaps tack on a Top 5 Hitman Agencies Similar to HoF.
A list of Pending hits for people who have paid money and are waiting for completion.
A seperate list for people who have hits on themselves to Buy off the current hit. An extra spot for people purchasing the hit to make it anonymous.
It's large, and i've got a few more ideas to expand with, I was going to do this awhile back and make it a free mod for everyone, but just have so much going on right now.