M Saba Moa talks about this gun case project the size of a viola, which is slightly larger than a violin, to be able to fit a P90 airsoft gun so it can be transported inconspiciously to a survival game park. This is inspired by Henrietta from the Gunslinger Girl Manga Series.. "P90 is too small to fit into existing violin cases. I will report on the production of a Viola-sized P90 gun case in several parts. It's a matter of trial and error, but if I can come up with something that has good finish, strength, and durability, I might sell it at a low price. We will inform you at the end of the series. This is manufactured as a gun case and is not intended for musical instruments."