Sump help

[makana]

[IMG][/IMG]

okay so here is more or less what I was thinking. The red circle represents removing or cutting out as much as I can safely remove of the first chamber wall so that I can get in there with a siphon to clean it out.

The red line is removing most or all of that baffle. I was thinking of possibly keeping part of it and using the egg crate as a frag rack, but i could put that anywhere.

The blue lines are the new baffles, the one on the left would be sectioning the return area that would also house the cheato. The one closest to the return pump would be to keep a constant water level for a skimmer section.

My questions are what depth and width should a skimmer section be and since I have never designed or built a sump, does anyone have better suggestions for me or things I have overlooked?