Originally Posted by Avro748
Hi and welcome to the forum. I have a trick to finding dimensions that never fails.
Step 1:
Obtain a relatively flat image or poster of the part you need dimensions for. Here's one for the Q400's MIP and overhead:
http://www.avsoft.com/index.php?q=node/171 (Note that the three drawings are not to scale with each other, but the individual ones are to scale with the same part on the real aircraft. There is also a pedestal drawing, but it is top down and won't be of much use)
Step 2:
Use a dimension that you already know, and scale the image from there on your PC. It could be an instrument, a lamp, or even a fastener.
Step 3:
Start drawing a plan in Autocad based on what you find, the more pictures you use and scale up, the more accurate it will be. If you find something that contradicts something you've already done, find more pictures until you get your answers. Remember that nothing needs to be exact, as you won't notice a few millimeters while you're flying. Good luck!