Thanks for the input everyone, it is appreciated. I want to make the pump external for the following reasons.
1. Reduce the amount of heat in the water.
2. I purchased a cone skimmer a few months ago and it did not fit into the sump's second chamber. I cut the baffle between chambers 2 and 3 so it could fit but now my return pump and skimmer were in the same chamber resulting in micro bubbles going in to the display. So, to eliminate micro bubbles.
3. After inserting another baffle that could accommodate for the size of the skimmer, the pump did not fit anymore.
4. Pump finally died on me yesterday.
5. I like messing with stuff.