well there you go - learn something new everyday 
although, if your mounting to the pillion peg, wont that mean the trailer affects the rear suspension on the bike? if you mounted it to the swingarmlike luke it would be "lighter" as it is unsprung weight?
I look forward to seeing it anyway, sounds like an interesting build (I asume you will have some sort of "swivel" mounting so you can still lean over with it fitted?)

although, if your mounting to the pillion peg, wont that mean the trailer affects the rear suspension on the bike? if you mounted it to the swingarmlike luke it would be "lighter" as it is unsprung weight?
I look forward to seeing it anyway, sounds like an interesting build (I asume you will have some sort of "swivel" mounting so you can still lean over with it fitted?)