I love this thing!
https://www.bikebound.com/2022/04/06/yamaha-rd350-hillclimber/
I'm not one for choppin em up but it looks good to me and if it was already a hill climber, may as well go with whatcha got:)
This builder has done a few other pretty cool bikes as well, welding skills are insane.
dt1 frame. its cool. btw the carbs are from a T500. they are heavy as hell. but 32mm roundslides