Update finally.
I went to my local hardware store and purchased a sheet of acrylic 20x32 inches with a depth of 1/8 inches.
There are smaller sheets available but I felt this size would suit my needs best. I'm basing the following dimensions on the S.H. Figuarts Masked Rider Black RX and the MMPR White Ranger. Both have have roughly the same dimensions of 6.125" x 1.75" x 7.25" (L=6.125",W=1.75",H=7.25").
I'm going to be bending the acrylic so I'm essentially going to be needing 2 pieces: piece 1 which will be the front, top, bottom, and L + R sides. I'm therefore going to have to cut 1.75" from each of the corners (this can be seen below in the dimensions sketch in blue); piece 2 will consist of the back piece only, it's dimensions are 6.125" x 7.25".
The plan is to bend piece 1 and mate it with piece 2 with screws.
In order to reduce waste, I cut my sheet into six even pieces with the dimensions of 10" x 10.6875". ***excuse the 10.75"--that should be 10.6875". I added some variation to the dimensions because I'm not looking for a perfect fit but one that will be just right.
After cutting this piece (it's one of the six even pieces), the next step is to remove the four squares at each corner so that I'll be able to bend the sheet.
Be extra careful in this step! I'm using a model kit blade and a plastic knife. The plastic knife wasn't very effective with me so I recommend using a good exacto knife to do the job.
Place painters tape (or some other thick tape) over the areas you will be cutting to protect the acrylic and give you a better cutting guide. Take your time; this will be a tedious process and you don't want to accidentally crack the acrylic!
If you have access to a cutting blade, you will have a much easier time cutting the squares out.
After cutting the four squares from each corner, I ended up with this.
My cuts weren't perfect and I managed to crack/ break more than I wanted to. I went ahead and melted the broken pieces with my solder tip.
I tried to begin the bending process with a mini hair drier, but it wasn't powerful enough. I'll be getting a heat gun or something else that will provide the necessary heat to melt the acrylic very soon.
This project isn't very difficult and I'm sure most of you could easily make some cases. This project can be a bit onerous if you don't have the proper tools, and/ or you are short on time.
This first case will definitely not be perfect, but I wasn't expecting it to be. My next cases should turn out much better, as I know what to avoid.
If you have any questions, feel free to ask. For more info, check out some videos on YouTube on shaping acrylic.
Final Update.
My first case came out absolutely horrible. Having learned what to do and not to do, my second case came out much better. It's not perfect but it's okay.