If you do not want to drill the tank, which I STRONGLY suggest that you do. Have a glass shop do it for you, this will be the first chance for you to spend some coin, albeit the smallest amount to come.
BUT, if you don't, then get a Lifereef hang on the back overflow, the single chamber should do it, I have one on my Oceanic 50. It uses a U tube; which never loses siphon. DO NOT get a CPR overflow.
Then go check out Ecosystem for the sump/refugium. It uses an external pump. I use the Titanium T1. It is dead silent and will return the exact amount back that the Lifereef drains. You really want low flow in the sump. There are other sump/refugium manifacturers out there, be sure to get one that has a refugium section. Then put the Miracle Mud and Chaeto and some Live Rock into the sump.
For additional flow, plum a Closed loop or use powerheads.
If you by it online you could have it all runing in a week.