that's cool, nice one steve. my telescopic work on different principle to these, each rung expands, these kind of slide into each other, as in the top half slides out of the inside of the bottom (not explaining very well, I think I know what I think they do!)
my ladder never felt sturdy, swore to my wife there was more chance of falling off these in the 2 mins a day I use them than spending all day on proper ladders!
was thinking of getting a 6 foot triple to fit inside van, but not so easy if got to lift ladder over garages, etc.
this def looks the job, cheers mate