Stumbled over this little gem whilst searching for a 1U rack dxf.
Rane Pro Audio Products offer DXF and DWG drawings of the chasis and panels for all their products to allow custom orders.
There’s plenty there to fuel ideas or minimise works.
The Cad files are here http://www.rane.com/cadlist.html
And you can get the product photos and info here http://www.rane.com/procat.html
enjoy!
sid