Wagler uses a lot of Ross pistons. They held up better in Cummins Killer than anything else when they were having issues from other items. It's also what's in Farmer Dave's engine.
Brett's bottom end should be very stout with the hemi rod end Winberg crank and Wagler rods.
The only problem I see is the further you push the envelope the more risk of failure. After you see a Winberg crank and the bigger bearings it's pretty hard not to go that route. My Wagler motor was flawless this year, wish I could say the same for turbo's. With 2 great guys like Mark and Brett working together that truck is going to be a monster.