This is the land side view.. On the tubs that we are breeding turtles in we found it a lot easier to use planters for the egg laying.. We use the 24" planters you can buy from Lowes. If you trim the edges with a razor knife they fit perfect and its a lot less area to look for eggs in!!
The tub to the left (with the lid closed) does not have a egg laying planter in it. The tubs come with a deep void to fill so if you filled it with just rocks it would take a bunch!! Another little tip is you can get styrofoam blocks and use a had saw to cut them to fit snug and only use a few inches or rocks to cover the styrofoam. If you have a tractor supply around you look out back they have stacks of styrofoam blocks that trailers come in on and if you ask they will give them to you for free!!!
ALMOST FORGOT!!! If you are going to set them up outside make sure you drill 25-30 holes using a drill bit size of 3/8" but not more than a 1/2". Then put 1 layer of rocks then the styrofoam cut the styrofoam block 1" smaller than the hole, center the styrofoam block then put more rocks around and at the same time on top of the styrofoam block. This allows for good drainage during rain storms and the big holes allow for some debris to get by.
We have had great success with these tubs!!!