During design, in a design-build delivery method, what is the design-builder responsible for delivering to the owner?

During the schematic design phase, a contingency line item in the estimate would be included to cover which of the following? 

Where can you typically find requirements for temporary toilet facilities? 

Which team member is actively involved and interested in all phases of the project? 

The owner's budget may not be adequate to pay for the entire project. What method is used to allow flexibility

in the event that the budget is exceeded by the bids?