Does anyone know where i can have my interior custom designed on my 1985 Chevy 10 Truck  

Daniel, that's a pretty vague question. It depends on how far you want to go, how much you want to spend, and if you have an idea of what you want. LMC Truck has a lot of custom parts for that era of truck. They'd probably be a good place to start.  It also depends if you want to retain the basic shape and design of the stock interior, or if you want to completely gut the interior and start from the ground up. A little more detail would help. Thanks.  

theirs no amount on how much i would spend I would like to retain the factory shape of the truck on the inside, but i would like to be able to put some bigger speakers in the dash and make them to where you could see them but i don't know how to do this i have no experience at fabrication and i don't where to start.  

Well, I'd try to find a custom audio shop that has a good fiberglass fabricator. If you're going for a custom speaker setup, and you really want it to be custom, fiberglass is the way to go, in terms of being able to be really creative with it. Long-term, yes, it has a tendency to crack, especially with heavy woofers. But if it's designed the right way, and it has enough reinforcement and bracing, it should hold up pretty well. I know Hill's Hot Rods out of Lubbock Texas specialized in the "square-body" Chevy trucks. They've done some really nice work. They're not cheap, but if you really want to go all-out, they're a good place to start.