Hi
Try the product configurator in CS-Cart demo store, see if that is what you may be looking for.
With a little imagination you should be able to use the product configurator for this. As a custom computer builder, I can honestly tell you that for the price-range in a PHP cart, you will not find anything close to the options in this product configurator. I originally purchased x-cart for this at a much higher price but am converting because of the better options and client usability.