how tall is the scoring grid column?
Some great guys over a FIRST made a manual! I bet it’s in there!
Hint: Section 2.2.3
OR! The field drawings would be helpful too! Check under “Game Specific”
…or you can reference plenty of ongoing discussion right here on Chief 
lol
The top scoring pole on the ledt and right is 102in tall. The scoring one in the center is 111in. Our Team made one out of wood and PVC pipe. If you check the rule book, it will say. Good Luck