I had already virtually redrawn it as it had several anomilies and although the UP software accepted it I could see from the raft it generated with a large triangular hole the file was flawed.
Today I had more luck and the chassis came out fairly well.
Here it is printing you can see where it puts in the support structure for the motor mounts and front and rear scoops.
![Image](http://i109.photobucket.com/albums/n66/PeterW_2006/P1000670_zps8dea2f79.jpg)
Here is the final chassis which is quite accurate althougth the scoop on the left is not joined to the base, I need to fix the drawing for that.
![Image](http://i109.photobucket.com/albums/n66/PeterW_2006/P1000672_zpsaef412e4.jpg)
I need to make the basic structure a little thicker (all 1mm at the moment) to give it more strength and hopfully reduce the not too bad curl of 1mm at each end.
![Image](http://i109.photobucket.com/albums/n66/PeterW_2006/P1000673_zps5f20615a.jpg)
Here are a couple of shots showing one of the motor gearboxes in place.
![Image](http://i109.photobucket.com/albums/n66/PeterW_2006/P1000676_zpsf4b84acf.jpg)
![Image](http://i109.photobucket.com/albums/n66/PeterW_2006/P1000677_zpsbfd553bd.jpg)
All in all not a bad start but I recon I can make signifcant improvements.