Need some help with rack measurements

[Navy]

If you want 8 levels high it will be different. I only accounted for 4 levels high x 2 wide. Which my math is 100% correct. I am a carpenter so its my job to be able to design an build stuff like this. If you want to add more levels to my math you would need to at 6 7/8" for every level.

My 4 key sticks

4 levels*

but thank you