Here is a picture of the rack I saw I had stored online. This in the old location. I'll get some new ones and measurements later on today.
Keep in mind this was build about 10 years ago and for a Bear Whitetail II. I swear my arrows were 4 feet long. The bottom of the rack has a small hole drilled about a 1/4 in in and the top of the rack is drilled all the way thru. So I could push the nock end thru the top and then setthe arrow tipin the small impression in the bottom. Worked well with the long arrows. Now I need to update it somehow to hold the shorter arrows. I'm thinking of adding a peice of 1 x 3 across the back that has some dial rods sticking out. Sorta to hold the arrows in columns. Not sure yet but you get the idea.