Compart, to help you do this.

Use the exhisting ashtray, lighter, airbag panel as your actual template for the bottom. In other words you already have what you need to flow that into the bottom shifter surround panel. The lighter ashtray area can be modified and blended into the switch panel.

No need to reinvent whats already there. Hope this helps and we appreicate it.

edit:Oh and forgot to mention if you go to Home Depot, they sell the Owens Corning insulation foam. It comes in big pink sheets. This stuff is perfect for a project like this as it forms extremely well with a plastic sanding block and you can shape it any way you want. If you're any bit artistic its awesome for projects.

I used this stuff to make my rear diffuser copies of the Startech diffusers. I just need somebody good with fiberglass to actually do the molds. But the stuff is awesome to work with becuase its resiliant but moldable.