For the case I decided to use acrylic. I took two pieces of Plexiglass and used one for the bottom (1/4") and one for the top (1/8").
I cut the 1/8" piece down to about 10" x 6". Cutting acrylic is not as easy as it looks. Careful use of a straight edge and some clamps is advised. If you have a table saw or something that might be a better option. I don't have one.
I wanted to put four bends in the acrylic sheet roughly spaced at 1", 2" and 5 1/2". To do this I clamped down the sheet on top of a straight edged piece of shelving and heated it with a heat gun. I held the gun much closer than you see in the photo and kept it moving evenly right across the intended bend point. Every ten seconds or so I would apply gentle pressure to the free end of the sheet to see if it was flexible yet. It seems good to be patient and just keep heating and pushing slowly to get the desired angle evenly across the sheet. If you see bubbles forming in the acrylic, stop immediately. You've over heated it and it is now producing fumes that are combustible.
This method produced a bend with probably a 1/4 " radius. If you want a tighter angle you may want to use a straight edge on top of the free end of your sheet to push more evenly and closely to your bend point. For the effect I wanted I just pushed along the edge of the sheet with the heel of my hand.
To connect the top and bottom pieces I wanted to make it removable for future enhancements and repairs. I used a piece of aluminum. This is addressed in a later step.