I have not had the opportunity to use these skylights on a model yet; however, they will be a perfect addition to my build of the DKM battleship Gneisnau which I will start soon. The detail is excellent.
After email discussions, DiStefano may adjustments I suggested and then printed the catapult. The detailing and refinements were much better than what I had previously ordered thru Shapeways. Recognizing the capabilities and limits of 3d printing, I will need to make some refinements by replacing 3d printed cabling with fine braided brass wire to represent wire cables for the catapult launch trolley. Other than that a very nice piece of 3d printing.
Despite the online catalog images the actual product is amazing!