Oddly, the ribbon cover latches are reversed between the two shell designs. You lift up the back on the JP-7, but lift the front on the G3k.
Both shells have 4 screws at the bottom that are removed to take the shell off. the mounting holes are identical.
Once you have removed the 4 screws, just lift the back of the machine and slide out the back, just like a Skyriter.
There’s just a few differences between the two machines.
Just a loose felt pad at the bottom helps the noise a lot.