SecurityBasics.DefaultPermissionInfo = new PermissionInfo(PermissionAction.Grant);

Then, I have to specifically deny people access to everything they should not have access to (the taking-away-the-keys-to-the-kingdom approach).  I see more why Greg suggested deny as the default (the don't-let-them-have-the-keys-at-all approach).  This will take a bit of time to setup.  I see why you suggest waiting until the end of the development process; however, I may have been better served to consider some of this stuff up-front.  

Thanks for your help, gents!
Bill