I recall having read about a project which lets people turn Lego Game Boys into working Game Boys. I was reminded of it when I saw a link to the official Crowd Supply project, authored by Natalie Cursio. While I am not purchasing a Lego Game Boy and Build A Boy set myself, it is a very neat project. I tip my hat here from my humble website.
The “Build A Boy” Project
Build A Boy is a retro gaming handheld you build from scratch, brick by brick. The shell, the electronics…all of it! This DIY kit turns the Lego Nintendo Game Boy replica into a playable system using carts from your childhood, with a few modern twists.