Your sump will be set up for your needs so no two sumps are the same.
Here's a pic of the sump: I used a little over 1 .220 thick acrylic sheet 18x24 and a 10 gallon tank with black trim removed from the top. (Trim removed till completed.)
10 gallon with all the chambers dry fit with tape to hold them in place.
from above: In this pic you can see all the chambers. Starting from left to right
1st return pump chamber.
2nd two 1" mini chambers that work as bubble traps. Break up air bubbles before reaching R. pump.
3rd this chamber can be used as a mini refug for macro algae, sand, or LR. It also can be used for your heater, etc.
4th chamber I divided into two parts: Smaller section is the intake box that will be filled with ruble and the water inlet. The larger section is where my skimmer will sit.
Here's a shot of the baffle and intake box. If you notice I have a piece of eggcrate below the black painted side. The side of the intake box will sit on this and allow the water to fill the skimmer section from the bottom rather than filling the box and flowing over. This will force the water to travel through the LR ruble and act like a pre filter.
Here's a pic of the baffle and the middle one will rest on eggcrate also.
These are my cheater sides. I cut a grove in the center of each (black marker lines), this will make it alot easier to glue the three together without and not have big blobs of silicon between each baffle.
Pic's of the three baffles taped together for a better idea of how they go together. After glued I can slide all three in place and only silicon the outside.
Two views of the skimmer and intake chamber.
Like I said this is a quick overview on how to build a sump. Also, all my parts baffles still have the clear plastic on except the piece sprayed black.
Hope this help and feel free to ask any questions and add info.