I made a 3d model of Captain Ufo's ship, including the interiors we've seen so far in the comic. I mostly use it as a reference, though. I don't like how the look of 2d exports of 3d models clashes woth hand drawn elements. Even when I use the model in the comic, I end up redrawing/retracing large parts of it.
I do like drawing backgrounds (at least up to the moment I remember that i have to color them afterwards :P). These two panels hare hand made, for example (well, actually a large part is made with the vector pen tool in Photoshop, what I mean is that it's not a tracing of an existing picture or model):


Oh, spoiler, I guess: these will come in English here on Tapastic in a couple of weeks 