Back in the day, I had an Avenger twin, it was before they were built out of ply. the sides of the tub were some kind of soft thick wood that smelled like pencil wood.
The sides were like 1/2" thick.
I had twin ops 80's in it, and it ran pretty good !
Running in a heat race in houston, the boat blew over on the front straight, went about 50 ft in the air upside down and slammed flat against the water....it blew the side of the tub in half lengthwise..split from front to back.
I replaced it with an avenger/spider which had the plywood tub...
I still have an old cobra in a .67 size... boat was fast, predicable in heat racing, but I'm sure it can't compete with today's boats..