Big open tillers are really popular here on the west coast, especially who shallow deadrise for running rivers with a jet. In my opinion, they are made stronger and are tougher than any Brunswick product. Alumaweld, Duckworth, River Hawk, Hewescraft, and I think even North River has an open concept tiller. These typically have .160 bottoms/transoms and .1 to .125 sides. All welded and will handle a lot of HP.
Check this out:
https://www.alumaweldboats.com/Adventurer20.htm
