Just keep in mind that when the Feds have a project they're committed to, they don't care about how you feel about ethics and motivations. They can, without losing any sleep, decide to turn the screws on you for some perceived legal violation in order to get you to co-operate. Your openness to co-operate "but not under pressure" isn't necessarily your choice to make.

This feels like one of those times where someone really needs a lawyer but is too "smart" to think they need one. I'm friends with a group of about a dozen current/former criminal defense lawyers and this feels like the beginning of one of their classic stories. Just please be careful. =)