If you want to sell it as a stand alone component, my understanding is you should be fine. (I am not a lawyer, or product expert, so take that as internet advice :-D )
If you want to sell it as an assembled device, with board, PSU etc, you'll need the whole lot to undergo the gamut of CE tests: suggest you steer well clear of those...
Keep stressing that it's a low volume hobbyist thing and include disclaimers when you sell them. And good luck!
PS - more pics!
