RedDad
Smitty Werben JagerManJensen
Ride systems are proprietary, so you're not likely to find much in that regard readily available on the internets. The construction documents for a lot of the buildings and other structures (that aren't considered ride systems) on WDW property are submitted for permitting (although the code authority is also owned by Disney), so some of those drawings show up from time to time.Cough, something with a little more detail. That one is great and well done. The site does not seem to allow you to zoom in.
There was a fairly interesting article published about Spaceship Earth when it was constructed, which had some conceptual drawings showing how the sphere was constructed, etc. Unfortunately, the only drawings of rides you are likely to find lying around the web are of the "fan produced" variety - at least in my experience.