Berg, wow how did I miss this thread?:p
I wouldn't worry about the solenoid on the discharge. I'd just run it out of the other side of the boat. so when the left fills it overflows out the right. When the left is full it will lower the left side of the boat which will raise the discharge more than a foot from the normal overflow height.
Either way let me know, I'd love to help. You buy the beer, and I'll drill the holes in your boat. I need the practice, I'm doing mine this winter too! ;)
What... I have the tools!!!
Seriously we'll make it work. Give me a call lets do it.