Been working on this for quite a while and am so happy to have got it into a state where it's actually presentable.
It's a Sonic Potions LXR drum machine in a custom acrylic case that is opaque with cut-outs and coloured acrylic inserts for the different coloured indicators - all the LEDs are actually white. The LCD is also covered with a clear panel (actually fluorescent blue!). The current to the LEDs is still not right and needs reducing but you get the idea. I was really keen to find a solution that would break the need for a transparent (or semi-transparent) case.
I'm also in two minds about painting in the engraving. The top panel is made from a special acrylic that is metallic grey but when engraved should show through black but I couldn't get my laser cutter to cut it deep enough.
I've also made a top panel from frosted white acrylic (again with coloured inserts for the indicators) which gives a very different look. I'll post pictures of that one assembled once I've sorted the current-limiting on the LEDs as you get a lot of light bleed through the semi-transparent material.
Sonic Potions LXR acrylic custom case perspex custom case