pic: 2010 Break Away

[RoboTigers1796]

Did i build our team's bump wrong or is the manual just wrong in saying the bump is 12" high? Going off the team field drawings given by FIRST the "rib" as they call it, or ramp supports are 12 7/16 high then when assembled with a 3/4" piece of ply laying on top leaves the height of the ramp at almost 13 1/4". More than an inch difference from the supposed 12" high ramp used in this year's game. Has anyone else had this problem? Is the drawing, manual, or (verly likely) me wrong?
Also the 1/2" transition from the field to the playing field. How far from the bottom of the ramp does the base plate extend? The reason I'm asking is because depending on the distance of the 1/2" transition from the bottom of the ramp it will greatly effect how the ball rolls to, and up the ramp.
The section in the manual im referencing to for the 1/2" transition is The Arena, Section 6.2.3:

6.2.3 The BUMPS
Two BUMPS are located at approximately one-third of the length of the FIELD. Each BUMP is 12 inches high, 12 inches wide at the top, and extends across the spaces between the TOWER and the Guardrail System. The BUMPS are covered with the same carpet as the rest of the FIELD (although of different colors - red and blue). Each BUMP is colored red or blue, corresponding with the color of the nearest ALLIANCE STATION. The BUMPS are fixed to base plates that are secured to the carpet of the FIELD to keep them from moving. The base plates are covered with the same carpet as the FIELD. Note that this forms a small (approximately ½-inch tall) transition from the FIELD surface onto the base plates.

The bump is confusing me so much this year. Maybe this will further help you understand what I'm asking for the second part if you still don't know what the heck I'm talking about.