i would def use the silver as a base it will give the red a much deeper look and it will pop out at you. as for light and dark shades you can play with that with air pressure and amount of materials applied. PPG 2042 is an awesome clear but it was designed as a speed production clear, as in baking the vehicles after paint. I would prefer 2055 or the new 3000 for show finishes. 3000 is a little tuff to do an all over beacuse the mix ratio is 3:1 and there is no reducer so you will get dry spots. Mixing paint companies will not hurt anything as long as you use the proper hardeners with each particular company. Reducer is pretty much all the same. Just use a straight black for stripes. And for future refrences count the amount of candy topcoats you apply at what psi at the gun incase of need of touchups!