Eshopps sump

[okcguy2141]

I got a 125 gallon aquarium second hand and it came with this sump. I can not find any information on how to set this sump up. Does anyone have any ideas on which compartment is what. I have a skimmer and return pump that will be going into it. Plus of course media, bio balls and filter socks

 

[Peace River]

It is hard to see the pass throughs for the water to flow based on the angles of the pictures, but the end compartment appears to be an ATO reservoir. The small corner compartment may be the drain pipes, the thin compartment could be a wet/dry area, and the other two would likely be for the return pump and skimmer section. More pictures from the side and side/end, downward angle would be helpful to over a more definite response.