Step 15: Test Ride!
Remember that you will have a pretty wide turning radius as this bike's a little over 9 feet long! You should find that the low center of gravity makes this bike easy to balance. I think you will also find that it's pretty fast. I can easily get to 34 mph on smooth flat pavement. Keep in mind that your brakes may not be up to the task of slowing you down quickly from those speeds - they may melt if you aren't careful. Also, cars will probably have a difficult time seeing you. I don't ride mine on the road anymore unless I am with a group. Toe clips or clipless pedals are very nice to have.
You will almost certainly want fenders as soon as you are done with your first ride. I made mine with these instructions.
Paint it as soon as you have all the bugs worked out, and please post pics - I love to see what people build! This is not a terribly difficult build and the results are well worth the time. This is my favorite bike out of the 15-20 I own. It's comfortable and fast and always attracts attention. I'll keep an eye on comments, so let me know if you need a photo or better explanation - enjoy!