I would approach this much the same as John has stated. However, the additional costs would need to be accounted due to the 'hand holding' and the extra work that you will need to do, unless this is a Code minimum type job.
I too like to discuss the clients needs and offer options. Unless I know the customer, I will not leave a plan that I have drawn up just so that someone else gets some free engineering. Why should other contractors get the advantage of my experience and knowledge?
