Good looking install.
A couple things:
Google Ancor wire seal. I've used this on my kayak for years to seal the area in the hull where the wires go through. It's inexpensive and IMO much better than a few of the other ones out there. They make 3 or 4 sizes depending on your wire size, so you have to choose which one will work for you. Looks like this.
Here it is installed.
Your box is currently right in the center of the front hatch area. That will likely get in the way of anything that you want to put in there. I sometimes store my cart (broken down) up there, or line the hatch with a super duty plastic bag and stuff one or two keeper stripers in there.
You might want to consider lashing this to the sail mast to get it out of the way. Just an idea.