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Clarifications

You might want to consider figuring out how long it would take you to do the job. Once you have an idea of how long you quote them a range of hours and the hourly rate that you will be charging. If they have a range then you will be able to absorb some of the costs if you run into problems during your swing migration from SBS to SBS.

The beauty is that if you get done at the lower end then you look like a hero and will get more business and have a great reference. If you go over then you still look good because you only charge them up to that higher price you quoted and eat the rest.

That's how we did it at a contracting company that I was part of.

Best of luck with the project.