Here's a draft I did for my sump, about 15 gallon I think? It is fed from the tank and gravity drains back in, so you can ignore the bulkhead placement, I'd assume you'd maybe not need them if draining from tank and pumping back up? I also ended up scrapping the baffles on the right hand side, leaving only the single 10" baffle to separate the skimmer from macro areas since no problem with micro bubbles.
I would suggest deciding what skimmer you'd like to use and going from there. Also, if just a standard 10 gallon tank, do a google search for 'pressure locking baffles', easy to make and removable / adjustable.