Ok making some progress now fixed issue with rails being exposed with a bed overhang - read allot about ball screws so going to tackle that next - feel the learning curve is huge and keep going back to the design and tweaking, feel like this is never going to get finished . And as i type this i am thinking i have no cable tracks (are they called "energy rails") so another snag added to my list!!

Click image for larger version.  Name: Getting there.JPG  Views: 184  Size: 65.0 KB  ID: 19358 Click image for larger version.  Name: overhang.JPG  Views: 200  Size: 31.7 KB  ID: 19359

Sherpa