Here is a picture of my trailer build so far. I have an old plastic baby seat that goes behind the seat on an adult bike. I think that the metal support frame for that seat will make a good start for a "frame mounted hitch" for the trailer. However, in order to use mount the hitch, I'll have to take off the package carrier and bag. Now for some "chair time" and a slice of fresh watermelon while thinking about my next move.
http://motorbicycling.com/attachment...1&d=1218398019