Check out Opa's other thread under "new roll out nest design picture heavy edited" too for plans for a six nest box and more details on dimensions.
That being said, his angles are ( I used the right triangle calculator of a google search to calculate his angles) 8.39* , 90* , and 81.61*.
This is for the 6 nest box not this one. His ramp height was 3 1/2" over 24".
Also, On that other thread TheGeekySheep used a 4" ramp, so while I was at it a used the right angle calculator to figure those angles too. 4" over 24" (that's the ramp length) equals angles of 9.46*, 90*, and 80.54.
Hope that helps.
Regardless of the angles, like Opa said, you might not want to glue and or nail until you test and adjust. Remember too, the eggs will roll differently with padding, which you need.