Tire stencils are available
http://www.gt40s.com/forum/vendor-ma...-stencils.html
If you have a rollbar check it is securely mounted to the frame just for your own knowledge. Finish is personal preference, black is more traditional chrome is more aftermarket bling. If you want to chrome the paint or powdercoat easily strips for chroming. I would be more concerned with the mounting and tube wall thickness myself.
Finishline has most of what you list but mats may need to be trimmed and edged to fit your footbox. Soft tops and tonneau's are available through Robbins that will fit your CCX nicely. I just set up a car with both and it makes it alot more useable if you get caught out or are leaving it anywhere. It can also extend the season alot depending on your weather. I am a dealer for the Robbins tops and also have the install hardware if you want any help with that. Hardtops are also available that fit over the lower forward mounted CCX rollbars.