I think it is time for you to trust your own instincts. I have seen many of the questions you have asked and even a few private messages or the last couple of years. I am just not sure what your company structure is, what power you have to make decisions and whether you have people in your company to ask questions of. Remembering that the purpose of being in business is to make a profit, the price you should give is the price that is appropriate for ALL of the circumstances surrounding this issue. If it is a competitive bid the right amount is the amount that covers your overhead, and is JUST enough to be lower than the second competent bidder. If it is a negotiated customer that amount is again enough to cover overhead and reasonable profit. Usually higher than a low bid situation due to value added service, but not high enough to be taking advantage of the customer.
All of that said, break it down. How much time to get the guys going. How long to set up a pull. How long to pull. How long to clean up. You are either going to be right or wrong.