The biggest issue I see with the dash you showed is that you will never be able to read the gauges. The glare will blind you as you have no roof. Ditto for the radio. I am not saying not to do it, just to think about some of the practical issues you will face when using the car when you design it. I don't really like G body dashes myself as I think they are not planned well, and the radio and A/C control positions are not good. The reach is too long for the driver, as the driver should be able to touch all of the controls without having their back leave the seat, and preferably with their arm still slightly bent at the elbow. That way, you can still be comfortable while playing with the radio. I would also use centrally located cup holders, maybe in the console, as the position they have in the S-10 dash is not good, and the holders are too shallow to work while going around a corner, or braking without knocking the beverage on the floor.