OK, here's a quickie hand sketch of what I was thinking of for telescoping legs, for the BSG. As you have sectioned in the picture above, I thought of three separate sleeves the slide inside of each other with inner and outer folded lips that act as stops and help to reinforce the the leg strength. you can go with more sections if need be as long as each section has the same mesh so that they all....mesh...together.
The inner and outer lips would be folded onto each separate section of the telescoping sleeve and final assembly of each sleeve would be folded over the previous part.
Savvy?