Darren,
My project was very similar - 445R completely rebuilt and converted to bass boat style side console.
Peter Webster has an article that i think he will run one issue soon.
Basically with my project:
new transom 2 layers 15mm ply laminated together with glass
new stringers 12mm ply
12mm floor glassed both sides
sides widened using 2" foam, shaped, glassed over, faired over (i paid somone to do this)
console was made by salvaging the old dash, and joining to it with divynicell glassed both sides, then faired over. (paid somone also)
2 years of work condensed into a 2 minute post but i don't have much time at the moment sorry. I will email you some more photos and PM you my ph no. if you want to chat.
good luck - it will be a great project.
steve