I hate to admit it, but it almost looks like sort of a decent concept. Thanks for the post Gene!!
Yes it is. It would be easy on my back...
But the first concerns that come to mind is just how solid it would be and the hanging weight. The wall I have that size adjoins our kitchen. If it was solid, I would have to bullet proof the framing of that wall. If I started knocking Sharon's knick-knac's off... That would be the end of me!
Then how solid it is and if the extension locks solidly. I know with the basic physics of years of forging and the design of classic workbenches --> they were built solid for a reason. Just like an anvil, if what you are working against, the physics of being solid, instead of absorbing shock, bounce back, that force works with you and helps you in your work. If it absorbs and dissipates that shock, then you have to hit harder to provide the same force and end up getting tired faster to do the same work...
Just a guess from what I see... How it really is may be just fine. I guess the proof would be in how solid it actually is... and what work you plan to do on it. It would be an expensive tool rack if someone didn't keep having a use for it.
But I tell you, I think that DC chip tray with all the gates (so you can choose where it draws from) is ingenious! That has a lot of possibilities in many shops.