new warhammer role playing game, any takers?

So this has kind of been on the back burner for a while now but I was thinking of trying my hand at.... modifying the deathwatch role playing game and making it a more open experience. The basic concept is that you're pirates who, for one reason or another, left the Imodium and are trying get some riches (and bitches). The players will take be renegade marines but if you're dead set on being a SOB or something like that we could figure something out if your interested just feel free to respond or if you have any tips or advice just let me know; is love to hear any