Saw one just the other day made from 25x25mm box section in the
Hafelle catalogue, got a loan of the catalogue from our local ironmonger,
sells all sorts of fittings etc, also the only tools they sell are Festool.(worth a look) website not as good as the catalogue.
love the clamp trolley but being from what is it 12/18mm ply, do you get lateral movment when moving trolley with all those clamps on, or have you a diagonal bracer tucked away in the back.
Would have liked mine on the wall but running out of wall space, but I think I will make mine out of metal, will be cheaper since I get to play with metal all day.