Read, read, and read the contract documents.
I'm not sure if the lien laws are much the same in your area, but here (CA) the chain of payment ends up with the property owner responsible in the end. Mall owners don't want to be caught holding the bag for some flaky GC, so your chances are very good for payment.
Normally, a chain store will be supplying fixtures themselves. See if you can find an existing store that you can take a look at beforehand. Some of the fixtures/items are "trick", and take lots of time to install, or need to go in at a specific stage of work. Make sure you have a schedule showing delivery dates.
Exclude items that don't directly apply to your work, such as concrete coring, sawcutting, patching (hence you get stuck with such things as x-raying the floor), etc.
Fixture support wires should be installed by ceiling contractor.
Make sure the plans are applicable to your area. Many nationwide chains issue "generic" plans, or are done by someone 1500 mi. away that doesn't understand your local needs.
Good Luck
S
