Hi Joe,
I do have a house battery in there along with a VSR/battery distribution cluster. That said, there is a lot of accessible room (without even having to remove the battery&switch) for this rod holder.
If I mount the rod tube in there (9" long by 2 1/2" diameter) I will likely clamp a hose at the bottom of the semi open tube and run it to my port side livewell overboard drain since I only use the port laz to hold batteries (one for each outboard) anyway.
I don't want moisture in there (I just finished replacing the original hatches with proper water tight ones). I would place the rod tube in a manner that even if the gasket/sealant failed unexpectedly, before the fix, any water would not come in contact with the electronics. I think I'm reasonably safe there.
I would not be placing a flush rod tube mount in the port laz, there are two batteries in there and not enough room.
I think it would be an efficient use of space and it would keep the top of my gunwale free of obstructions - a goal of mine considering we load dogs over the rail and everything that goes with keeping dogs comfortable.
Room for the stern cleat is fine with this mount too.
The thing is, I am going on a 3-4 day trip this week and would like to mount this holder so I can fish for halibut how I like. I just wish I had the gimbal available (I have to order it and it won't come in time) so I can see the whole set up before I put a hole back there. I suppose regardless, even if I don't like the gimbal downrigger back there, I will like having a halibut pole holder.
Just wondering if anyone has done this and has a horror story to share...I think it will work out very well but probing the experience of this forum is never a bad idea.
I originally wanted to mount downriggers on metal laz hatches to avoid drilling through the gunwale but scrapped that idea.
Barring any red flags, I'm going to do it. I'll post pics.
Mike