Girls und Panzer's Ōarai Girls Academy School Ship is big. Bigger than the Castle in the Sky. Bigger than the Macross SDF1. The 7600m vessel has been reproduced in a 1/40000 scale model, previewed at the recent Shizuoka Hobby Show along with a radio controlled Panzer IV.
a couple size comparisons
1/35th scale Anglerfish Team