A simple cardboard box, scissors and/or other sharp edge, glue, tape, bristol/poster board, and muslin or other light colored fabric is all you need to create a simple light tent. I used a hot glue gun to adhere the fabric to the outside of the side light windows.
A couple of views of the finished product:
A couple of tips I picked up were to not permanently affix the back round or the top fabric cover and use tape instead, as you can utilize different color back rounds and fabrics to achieve varying lighting effects, depending on the desired outcome. I monkeyed with a few different light sources and took some demo photos with the following results:
I need to do a little adjustment with the front lighting and may possibly utilize a curtain to produce more light in front of the fly. I'm also planning on acquiring a better lighting source, something in the CCT range of 5000°K to 6500°K that will produce a natural light spectrum. This will be nice to utilize while at the vise as well.
This isn't neurosurgery or aerospace engineering, but rather a simple trick to vastly improve the quality of your photographs. Hopefully this will help you take better photos of your flies.