I sketched out a sump/fuge setup with your size.
It is tight, but it can work. As was suggested, you have to make sure your sump will have enough space for water in case of a power outage. (by poking holes on the top part of your return on your main tank, you can stop the siphoning when it gets to that level)
In this sketch, you wouldn't be able to fit an in sump skimmer. you'd prob. need a hang on or an external one.
But, it should work.