I have used an aluminum dryer vent hose about 6 ft long, hung from the floor joists in my basement with a 60 watt light bulb in the bottom of it for a dry box.
Just hang the bow or bow blank from the joist inside the aluminum hose with the light bulb in the bottom will be just like a dry box. The heat rising through the hose creates an air flow from the bottom to top with a heat source to help the drying process........I have dried three hickory staves to bow dimensions in just a few days with this system. And I use it during the tillering process to keep the stave dry......
DBar