This is a very good ramp for finger boarding and is best for beginners.
Step 1: Set Up
About 40" of 3 1/2" wood. To get the pieces you need cut a 5", 6 1/2", and two 10" pieces.
Step 2: Putting Them Together (part 1)
Take one of the 10" pieces and put it under the 5" piece and line up the piece like in the picture. I put them together using work staples, but you can use extra strength glue or hot glue. I wouldn't use regular glue because it won't hold.
Step 3: Putting Them Together (part 2)
Take the other 10" piece and the 6 1/2" piece and put them together like in the picture.
Step 4: Putting Them Together (part 3)
Take the two pieces you just made and put them together with the piece with the 5" and 10" and put them on the bottom with the piece that consists of the 10" and 6 1/2" and put it on top. If you did it right that section should look like the picture.
Step 5: Check the Size
To check that it is about the right size look at the gap and it should somewhere between 1 7/16"-1 9/16".
Step 6: DECORATE!
I would use gel pens to do graffiti on your obstacle, but you can decorate it however you like.