Ideas and Guidance - Boat Improvement and Reconstruction

[fallguy]

I'll have to use epoxy right? Which mix should I get? What should I add to it? What are the risks of handling it and how do I do it properly? What tools will I need? What structure should I build the cradle with?
The bottom was all broken and rotten. It used wood slices of sort glued together. We just push it off and then there were these yellow sponges filling in the remaining space.
Thickness around 8mm, will confirm later.

Really appreciating the help!

Like I said, you need to build a tent and dry it up. It can't be wet.

The cradle can be made from available lumber, but I'd make it with 2x6s. Mainly to get it to a nice height where the boat is supported and you can reach inside easily without bending over too much. Then make it flat where it touches the boat. Easiest to flip the boat upside down and build the cradle over the boat; then move the cradle and put boat on it.

I'd use epoxy. Something used there; not sure where you are...avoid skin contact

You will need a random orbital sander and 40-80 grit papers, so the tent needs to be near power.

Boat has to be dried up or don't bother.

 

[jorgepease]

About the epoxy ... you stated some pretty low temps, read this, Cold Temperature Bonding with marine grade WEST SYSTEM Epoxy https://www.westsystem.com/instruction-2/epoxy-basics/cold-temperature-bonding/