Nice downrigger mount! Just a few suggestions:
1. If you move the downrigger forward on the board, it'll be more comfortable to turn the crank.
2. To reduce the amount that the downrigger interferes with landing fish, and to minimize the stress which the downrigger places on your mounting system, shorten the boom so the pulley is right in front of the nose of the downrigger's housing. This is a ten minute project. Because you want to position the downrigger cable as close as you can to the side of your kayak in order to minimize the effect of the downrigger on the tracking of your kayak, there isn't any need for a long boom.

3. You won't want to use the rod holder which is on the back of the downrigger housing to hold your trolling rod, because that would position the tip of your rod well in front of your downrigger cable, which would mean that your line would cross the cable when trolling, and could pull a leash-mounted downrigger release in front of the downrigger cable, which could result in tangles. Saw the rod mount off the back of the downrigger housing.
4. When you're pedaling, your thigh will hit the portion of the mount which is positioned over the cup holder. I suggest that you find a way to reduce the length of that board and the size of the PVC pipe which sticks down into the cup holder, so you'll have more room for your leg.
5. Add a hook to the system for your downrigger weight, so the weight won't swing around and bang on your kayak when it's up out of the water.
6. For suggestions about how to position your trolling rod, and where to mount the base for the rod, see the description of how I mounted a Cannon Lake-Troll downrigger on my Revolution at
http://www.yakfisher.net/smffiles/index ... pic=9918.0 .