I can answer a few. Piston slap is pretty normal from short skirted performance pistons. Narrow low resistance piston rings and a piston that has to grow into the cylinder (from heat expansion during engine warm up) and the pistons will rock in their bores. You will notice it gets quieter as the engine warms up.I'm interested in comments about others experience with piston slap.
Can anyone tell me what's up with the rear wheel wells?
Anyone else finding that the build of the car is a bit cheap? I have a rattle and a squeak...okay performance car, but missing large areas around the body when you're shooting paint? It' annoying to see when I'm detailing the car and remembering how much I paid. Am I being too picky?
Now missing paint, that’s not good. I would mark areas and discuss with your dealer. Have an estimate from a shop you trust handy, many times the dealer will opt for that to release a level of liability, but complain.
For the overall quality of the car, you can read many posts on this site related to build quality. I have to admit (as others will too) the build quality is marginal in areas (miss aligned fenders, hood, sagging rear bumper...). The only cure for this is a sunny day with windows open in Sport Mode. Enjoy the site.