Just took some photos. There's good and bad news. The front of the car is "really easy to improve upon" and the rear slightly less so. Uploading photos now, I'll add them to the first post and this one when they are up. Oh, and thanks do the exhaust layout, a full undertray might not happen.
*Edit*
I looked under the car and was confronted with this.
Uploaded with
ImageShack.us
Behind it is the radiator exit and sump. Like so.
Uploaded with
ImageShack.us
In front of it is a hole below the entry to the radiator (this pic taken between the front bumper and that flat plate)
Uploaded with
ImageShack.us
And finally the rear of the car. Could deal with improvement. Other side is the same, but less exhaust.
Uploaded with
ImageShack.us
So now I need to think about the reason that front deflector is there. I think it's to cause a low pressure after the radiator and a slightly higher pressure in front. A flat cover between the front *should* give less resistance and have a similar effect through sealing the front of the radiator. It may also lower front lift (yay).
The rear, well that's just messy coz it's cheap, but the rough aero shape is there. Time for plastic sheet and duct tape. Oh zip ties. Can't forget zip ties...