there is not much in the way of drawings out there. I assume you want them for scale modeling? I do have some photos of a Ford Chassis taken by Tony Smith as well as some underneath shots of a C60X. From there I am afraid you have to scale it as best you can.
I will past the pics if you want them a little later when I have more time. OR PM me your e-mail address and I will send what I have directly too you.
Cheers
Cliff