been a long time since I have updated the thread. I will just copy my thread from other forum..
closing in the transom, box in middle is fish box. Tabbed in with double layers of biax tape, the covered with some 6 oz. cloth.
closing in fish box. bottom of box is made from a 3/4" nida-core panel with 4mm Okoume on each side (scrap from my console/box on my fs17 skiff), the sides are then lined with a layer of 1/2" H80 Divinycell glued in, all filleted and covered with a 12 oz bix (bottom is double layered).
experimenting more with hatches, have two of these ready to go in. ...
Secured down the 3" angle for the console and leaning post. In each case, I drilled holes (double the diameter of the faster being used) through the sole and through the stringer, then using an Allen wrench attached to the drill to auger out a large void into the foam. Void was about 3" to 4" diameter and a little deeper than the bolt will sit. For the console the mounting of the plate was pretty straight forward, just had to cut a little off one of the angles so it would fit around the chase tubes. The angles for the leaning post took a little creativity. There is not enough room on the insode of the live well to have the flange of the angle - it would not leave any room to run drain/fill hose, also the inside of the well is not side enough to reach the stringers, so I reversed the angle and routed out the sole so I could bolt them right to the stringers. I will fill this void with glass so that only to top of the angle is sticking out above the sole - the sides of the livewell slide right over it
port side angle, the black under the sole is the top of the fuel tanks.

starbord side, you can see the recess better

dry fit before, you can see how the livewell sits on top of angle
console mounts. The console will also be glassed to sole inside and out.