As a contractor I can tell you that most reputable contractors probably don't need your job, and if you make things too complicated or troublesome, they will move on to other jobs that don't throw up red flags. Much of what you ask for here is reasonable, but bringing a second contract into the equation can set of some alarms that you may be a difficult customer to work with or even a litigiously minded person who is likely to try and bring a lawsuit whether deserved or not. Anything you want covered should be in the original contract.
As I contractor if I am installing a customers product or supplying my own, I am charging full overhead and profit above the install cost. I try not to allow customers to supply materials and when they do I tack on my overhead and profit in to the labor. Remodeling is one of the most time consuming services and if your not covering your overhead and profit in the materials and labor you will not last long in this business. At the end of the day after all said and done, making a 15% profit is respectable. Think about it, your the designer, the gofer, the physiatrist, the builder, shopper and the banker until you get paid. Never be intimidated to support your price, deliver a quality product and support it with proper pricing. Never let the customer supply there own materials. Movie theaters don't let you bring in your own pop corn, so why should contractors be any different.
Bathrooms traditionally have few to no natural lighting sources, so any lights that you include are important to the function of the room. Lighting helps not only with the use of the bathroom, but specific task lighting in the vanity and shower areas help enhance your experience there. Lighting for the bathroom can take several forms. The most common include:
Don't underestimate the importance of lighting in a bathroom. Sconce lighting at the vanity is the ideal way to get even lighting on your face, and installing it at eye level will help diminish unflattering shadows. Dim lighting is nice for a relaxing bath; bright lights are great for shaving or applying makeup. Adding more overall lighting can make a small bathroom seem larger.
And then the apples to bananas procedure of reviewing non-like proposals is just as frustrating. Some bring everything. From the paint to the tile to the fixtures and cabinetry. Others point you in you’re own direction for each of these and expect you to know what questions to ask when buying never-before, behind the scenes purchases that are required for a bathroom remodel. And you’re expected to review the costs a la carte vs as a package and come to a whole conclusion as soon as possible ‘cause if you want the remodel done in 5 months, we have to start in 3 and we’re booked for the next 6...wait, what??!?!?
A punitive approach to what could be unforseen and atypical delays may be a bad idea. I would suggest offering a bonus for the job being completed early rather than a penalty for it being delayed. If material is ordered, we can't make it arrive faster if something delays the shipment. We recently ordered a bathtub requested by a customer. It was promised by our supplier for a Wednesday delivery. Bad weather hit Texas and it just didn't leave the warehouse until the following Monday. It blew up our schedule for the project and it wasn't anyone's fault or mistake. If we have an employee critical to the project get sick or injured, we may not be able to get things done as originally scheduled. Jobs can get off schedule for a lot of reasons outside the contractor's control. Charging them for those things is likely to turn them away.