Jim_MI. Your solution as posted above, is very good based on my experience of Hobie kayak down rigging for the past 6 years.
After I bought my PA-14 in 2013, I was using the Scotty Depthmaster as it has some really good user features, but since I was sometimes fishing at depths of 110' to 130', manually retrieving the lead weight, with a "fish on" was a real pain!
Since I still had a 12 volt DC, Cannon Mini-Troll electric downrigger I used on my old 18' Jetcraft, I wondered how much current draw and battery would it require to use on my PA-14.
So, I found it drew about 3 A DC recovering the ball and a 18 AH battery would be more than enough to power the downrigger.....I bought a 18 AH, SLA battery from my local ACE Hardware store and mounted the Cannon as shown below. My new battery was installed under the front storage tub and the PA never knew it had the battery there due to the generous capacity of this kayak.
The end result was all I expected and what a difference it makes, to improve the fishing experience from greater depths. All I need to do is take care of the fish on my line while the lead weight is being recovered automatically!
If you can afford the cost of an electric down rigger, IMHO its worth every penny!
