The bracket for the Fire was hand made in my Garage Just some MDF (6mm) to build a box around the Fire (Left, Right, Bottom and Back) The top was left open for the power supply lead (an angled micro USB lead). However, it was designed to have a top cover if needed. The front frame is just some thin bits of Pine mitred to form a very basic picture frame style. All glued with some good quality wood glue, then painted in gloss white to give a smooth "plastic like" finish. Once done it then had some fabric tape (the stuff they use in modern cars to wrap the wiring looms (https://www.amazon.co.uk/Tesa-15mm-Adhe ... B00EVSD52M)) to line the inside edges and give a bit of "friction" grip and protect the tablet.
It could be done in anything really. If I was to do again I would probably try and do it in plastic and give it a spray over for a better finish.
More pictures can be supplied if there is an interest, just let me know.
Thanks
Stuart