After seeing Shelley's pic, I think it's possible to run a skimmerless set up, as long as waterchanges are done then you should t run into any problems...

Running a skimmer on this type of system may cause microbubbles since the sump is so short and bubbles produced from the skimmer has no time to dissipate. Maybe check out some YouTube vids and see if running a skimmer is possible and works without bubbles.

Also try a google search to see any sump pics on the neo tank.