Love the shot and your magic box.
I used Baader Solar Film Paper and made my own filter.
Basically, I used two pieces of black matting and cut a circle that was slightly larger than the lens in the center of the two pieces of matting. Then I placed a piece of the solar film over the hole of one and carefully placed the other piece of matting on top and taped them together. Then off to Walmart to the craft section for a piece of Styrofoam. I cut a hole so it would slide over the lens and taped the filter on the other side. Covered the Styrofoam in painters tape to make sure no white pieces get on lens and voilą I had a filter.
I will take a picture of my creation and post tomorrow.