[MidWestRacer]

Well, buddy, it sounds like you get to follow in my footsteps now. I'm making a custom "XMod" car myself, it's the Porsche GT-1 on Mods and Projects, but it doesn't fit any of the XMod chassis, so I get the fun job of making a chassis for the car. I know it's going to be difficult, but you should be able to fit dual 9's and everything else if you do it write, depending on how the body is configured. Another option is to try to find a high-top car (someone on here is working on a Mini-Cooper for instance) that will be able to hold a 9V in the top of the car (though that would cause the car to roll easier). It's all up to you and how much work you want to do to have a custom.