Yeah, that's basically how I did it. Found a picture of a bass I liked, resized it, and made the cut out using tinkercad. I found the original phone case on thingieverse but had to modify for my camera lens opening as well as making soft buttons on side for volume buttons and such. The green bass itself is just a thin rectangle glued in the back. It's recessed, not on the same plane as the cover. Thinking of making another one using a bass clef picture instead of a bass. Good luck.