Judging by the date, I could be a little late with this suggestion, but figured I'd offer one anyway. You never know who is going to have a similar question in the future and stumble onto the post. I worked with a company called GSN Technologies, LLC that produced software that did handled the 3d cable tray. It was all automated... took a bunch of the guess work out of the whole thing. I believe their website is www.gsntechnologies.com
Hmmmm.... Just so happens your number 2.. Their "Technical Consultant"..
You must be struggling for advertising a bit if you've got to go back 9 year old posts to place your advert?