How much should I charge to be a consultant on opening a fitness facility?

I am looking for hourly pay vs. lump sum for project and how much on each. I have the experience in fitness and getting what people what they want in a fitness center, I have always included that as part of being gym manager. I am now managing a facility, and have been approached by someone outside my competition area. Answers preferably from someone who consults and does gym build outs for a living.|||Somewhere between what you think you're worth and what you think the client will pay should do it !