I found some scraps of half-inch ply I had laying around and with a few other scraps of lumber made a box to dry the biltong:
The completed box:
View with door open:
View from top (with lid off):
The 60 watt bulb should generate enough heat to cause movement of air throughout the box.
I will be buying some top round or london broil and making some biltong tomorrow. I will post qview.