There appears to be a bug with the third large hull model when using the Altarian ship style. When trying to design a new ship using the large hull size the first two large hull models show up as thumbnails and the "cube" hull shows up, but the thumbnail for the third large hull shows a blank and when the blank is selected, no hull shows up in the ship design area. Furthermore, it does not allow you to add components.
Fantastic job with Dark Avatar...keep up the good work!