I was wanting a quick weekend project, and I've been wanting to add a Delta IV Heavy launch vehicle to my collection, so this is the result. This model is a departure, of sorts, from my usual stuff. I prefer to work in 1/96th scale, but this is in 1/144th scale. I chose the smaller scale because A) a 1/96th-scale Delta IV Heavy would not be a quick weekend project, and B) Erik te Groen is coming out with a card 1/96th-scale Delta IV Heavy later this year, and if it is anything like the other models he offers, it'll be great. The model features my normal skin-on-tube construction. (Sounds vaguely pornographic....) I design and cut the rockets "skins" to shape, then find model rocket tubes that are the appropriate diameter and that's about it. From a building standpoint, the challenges were the thrust structure for the engines and the nosecones. The nosecones aren't the "perfect" shape, but I just couldn't figure out how to incorporate the appropriate "bulge" in them in paper. One of the prominent visual features of the real Delta IV Heavy is the ridged and weathered insulation on the fuel and oxidizer tanks. The insulation is sprayed on somewhat like the shuttle's External Tank, but on the Delta IV Heavy, it has a dual purpose -- fire retardant. The rocket is actually designed to catch fire when it launches. If you've seen photos of December's first launch of a Delta IV Heavy, you've probably seen the heavy charring. On the model, the tanks were covered with a ridged paper that I found at an art supply store. I airbrushed it brown, then sanded the paper, giving it the proper weathered look.