Interested in attending a Mini in 2020? Minis are typically held on a weekend during April-July. Watch the Mini Christmas Expos forum to receive alerts (and emails) when planning and discussion begins.
What sort of control do you plan on using for it. There's super bright white leds around but they need a dedicated driver for them or depending on how the topper is to be built you could possibly use something like the 120led/metre strip and cut and join it to fill in the space. The strip could be modeled as a single pixel or alternately configured like the seizure stars that some people create.