I used a piece of software called sketchup to plan some conduit runs...it is 3D software that is really easy to use (after about 2 hours of messing around, I was making really nice models, try that in AutoCad). It would realy take a while to model everything you have going on though, but when you are done , the 3D model will answer all questions as far as what is interefering with what, how many bends etc etc. You can swivel and look at it all from plan, elevation, x-section, iso, etc. There is an 8 hour demo here:
http://sketchup.com/ Though it doesn't create the models, a program called NavisWorks lets you superimpose them all together , ie framing, MEP, sprinkler, structural, etc. Take a look at some of the models they have, I think it's Navisworks.com
Mike
