It is a very nice model - well done - the only snag I have with it is the seat angle - it does not look very practical for where the foot rests are. If this was going full speed the rider would be pushed right back. Maybe put some ruff human on the thing to test it out and see if the design work, but for me at the moment to does look a little off - as I said only a small thing with the placement but not the modelling.
Starting to wish I did not cox you in to take part now
All my images are in HD - Plz right click and view image.
3D Molder at AO.com.