Jason, nice innovation. Couple of questions?
1) what's the weak leak? I would think its the eyebolt/screws to the door. How did you reinforce it?
2) do you have a safety bar of a sort?
3) did you add a second control from the upstairs so you can close it if your up there?
4) what do you think the door weights?
I am guessing the door can't be more than 100 lbs or so and likely that's a 1500 lb winch or stronger. I think I would try to add a gear to make it open faster. Something along the lines of wrapping the cable around a shaft then mounting a larger diameter wheel at the end with a separate cable wrapped around it to the door. Just my thoughts. Thanks for sharing.