The easiest way would be to print it with a 3D Printer using my files from printables. Do you own a 3D printer? If not there are online services you can send my file and they print it for you. If your from the United States I heard they have 3D printers at some libraries.
Edit:
Here is a link to my print files, you can download and use them for free:
Oh! I thought it was like hollow on the inside with custom electronics, but this works equally well! I don’t own a 3D printer and I’m not from the US, but my friend owns one, so I could commission him. Thanks for the guide!