the reason why you dont see many guides to making carPC cases is because everyone's cars, tastes, needs are different. Everyone is going to build a different case according to what they want and how it will fit their car better. You can check out my site below and get an idea of how i build my truck pc, but there are no step by step instructions. Still lots of pics you can use as reference though. My site is not 100% complete yet, but should be enough there to get you started.