Very impressive trailer, was part of it once a ladder? I don't need to carry that much for now but it's good to know you can carry a fair bit as, one day, I could cycle long logs back. Do you get many comments from other people when cycling those loads about?
Thanks for the other replies. I'm looking at a cheapish £100 trailer to start with, then I can have a bit of a play with and changes as required. I'll look for a hub connection and see if I can get some decent sized wheels on it.