Bike rack for inside the car

Since we've been using Dan's Suburban as transportation to the ride starts I built a bike rack that fits in the back of the car.  A couple 2x4s and a couple fork mounts from performance bike and we have a great way to keep the bikes upright and still leaves room for our other gear.  This would also work well for a pick up truck, or just to hold bikes in the garage.  They are spaced just far enough that a third bike could fit facing the other way between them, meaning these could be staggered (or tessellated if you want to get nerdy about it) to create a long row of bikes.