Designs for Nesting boxes please

We have pretty nice nesting boxes, i think...but while we are building our new coop, we want to see what others are doing with regards to nesting box depth.
We have the sides and back that are pretty solid; the front comes up maybe 2 inches. Wonder if others have deeper nesting boxes, and how high they are from floor to roof?
I love Cynthia's portable boxes, and we will construct some of these for the broodies..  
ideas please-by the bunches!

My nest boxes are fixed to the wall with a sloped roof overhead to prevent roosting and pooping.

They have a 4 inch wide board in front so a hen can hop up and land on the board, not directly in the nest box. This prevents her from crunching eggs by landing on them.

Hub built them 14x14 instead of the usual 12x12, this was good because some Brahma hens and other large birds just aren't comfortable in a 12x12 box.

Ours are raised about 14 inches off the floor and the birds used to kick all the bedding under there and lay eggs under there and it was a very awkward spot to get to. Hub blocked that area off, no more floor eggs. If your boxes are off the ground, make them high enough that looking/reaching under them isn't too difficult. Or block that area off.

I have yet to find a nest box or a location that they seem to like. I saw one on a post here (I think) It was rectangular with a sloped roof. the opening was in one end . They were way more private than the ones we have. I think they like to be hidden away. Then the front was hinged so you could open it to get the eggs. I want to try some of those.