I think there is no reason to try to make something fancy here. When using this type of mallet with a fro, it will disintegrate in about eight hours of use. So the mission is to be prepared to make lots of these.
Another feature for improvement is to add a 4-inch rocket mass heater under the ramp. Maybe there can be an 8-inch thick mass under the ramp so you can heat the mass, but it doesn't heat the air too much. And then when the fire is out, the mass is still something like 100 degrees and keeps pushing warm air through the system. So in the fall when you have 12 hours of daylight and 12 hours of night, then you get 24 hours of drying time.