[justcuz]

Looks good, sorry to hear the brakes are being a pain. I was going to suggest an adjustable valve from Summit or Jegs.
In the old days the guys would drill holes in the backing plates to keep the brakes cool and the early NASCAR drums had a bracket that practically exposed the entire rear of the braking assembly. That was for cooling on a race car.
Not so great on an off road vehicle where your big problem is water retention inside the drum. That was solved by drilling small holes in the drums between the cooling fins to let heat and water out.
Probably more trouble than it is worth, just some old tech and education.
Keep up the good work and posting up the progress.