I like your DIY lightbox, Robby. The results are really good.
I used a lightbox myself, but then I realized in a long run it's just to much work to set it up. (unless of course you have enough place to keep it somewhere permanently)
Instead of a lightbox I started to use 2 strong photo bulbs on each side and a top light from my workshop lamp. I covered the bulbs with a white lightbox material to soften the light. Check out the photo.
And here's the result:
It's much faster to take SBS photos that way. I have the white background paper on my desk all the time during work.