If you haven't already visited, check out our 1:250 boxy designer friend ARUUU56709's website:
AB Papercraft
Browse around, there's papercrafts both free and for sale of mostly Indonesian and Japanese subjects in scales other than 1:250. What grabbed my attention was the 1:144 Tupolev Tu-2 and the 1:100 Mitsubishi B4N1 torpedo bomber that looks straight out of Porco Rosso!
Enjoy!