The casing is not cheap and the RGB Leds are quite expensive also (and there's 10 of 'm!)
what kind of RGB LED's are you guys using?
LED's aren't so expensive anymore :P
Recently I've bought a RGB LED strip (5Meters long!) with adapter etc for like €20.
Maybe you can extract those leds and use it for LeTOH? :P
btw, why don't you guys work with Jolla? I mean, to make it an official product, or licensing it? This could reach a wider audiance too (like selling in shops)