Looks like you have a good idea, I've made some changes to your diag and am returning it to you.My changes are made in Blue The "clean" and "dirty" is always confusion although when you look at the image you'll see what needs to be done The only concern is that the tank/sump looks like its divided into 1/3 and the smaller third is feeding the skimmer. Ideally you would want to balance it or at least be sure that the return pump to the tank would not drain the clean side. Other than that It looks good, have a look at the changes I made and possibly re read fabricating components 158 forward it may help drive home the idea of the clean and dirty side. Also you can include a refugia in the dirty side of the tank/sump. Looks like your on your way. If I can be if any help feel free to write, also if you would like to document your project I can place it on your own web page.
Yes, its looks and sounds like you have it. Some other things to think about Im not sure if your drawing i precisely to scale but you want to be careful about allowing enough space/area for the drip plate. If its too small (surface wise) it may fill up with water. A larger area will allow more air/water contact which is very desirable and will happen automatically but ensuring a fairly large drip plate. A general rule of thumb is if the box/sump is square then allow at least 1/2 for the drip plate. If its a rectangle box then use around 1/3 for the drip plate Also it looks (from the drawing ) that the middle separator is a little high. There is no hard and fast rule, and some water may overflow the baffle as needed but in general it looks like it should be about 1 1/2" below your filter pad area or overall 2 - 3 inches shorter than it is rite now. So in summary It looks in good proportion 1/2 and 1/2 the drip plate should take up 1/3 of the surface judge how high your center baffle needs to be. Keep me posted Feel free to send pictures or questions Robert