I'm glad you like studs too. I sometimes wonder why most people are so excited about S.N.O.T. Of course, there are benefits to having ultra smooth surfaces now and then, but I usually find that good ol' studs are more to my liking. (It also depends on the style of the MOC you're creating.) As to YOUR MOC, it's just as good as they come :) Perfect balance of basic system bricks and those that are a bit more complex (such as the nozzles).
Ha ha... I'm always going for the "LEGO look", Nannan :) But additionally, the roof goes up 2 plates each row (not 1 brick) so using roof tiles would have been too steep compared to the actual building. That, and I like the bumps. :)