Step 2: Bracket and assembly
One of the 'fenders' is used to make the holding bracket. The part of the bike which seats the handlebars + front wheel holds the carrier. The carrier does not follow the front wheel, but is rigidly attached to the frame (which is very confusing during the first rides!). The plate can be bent halfway around a pipe, or bar (similar size as bike frame). In a vice, the outsides can be bent 90 degrees, to get a bracket (omega shape).
4 holes have to be drilled in the bracket, and corresponding holes in the base plate.
To protect the bike frame, the bracket is covered with a piece of inner tube; the same is done at the base plate. Of course the paint has been cracked by all the bending: it has to be stripped and the whole thing needs a good paint job!