Hi Frank,
Unfortunately I don't have any pics of the interior arrangement.
I did do away with the top of the ballast tank leaving just enough of the sides to hold the battery, the inlet vents I had packed with 151 epoxy putty.
Other tweaks included a new prop shaft and prop, replaced all the electrical bits too. Having read a good number of posts I put the ESC, Rx, and such in a water proof box.
One other thing that may factor in is the boat had seen a fair bit of use when I was MUCH younger, in a saltwater lake, before being laid up for several years before this project. Do you think that may have something to do with it?
The only.others options I can think of is I might have made a hairline crack in the hull swapping the prop shaft, or one of the epoxy bungs failed?
Sean