I've revived an old WIP of mine started back in june 08 : the playable Ko Hyoteki midget submarine.

I had left it aside for a long while while completing my Jyunsen B mod. I now think that the Ko Hyoteki might be a good addition provided someone out there start making historically accurate missions for it such as Pearl Harbord, Sidney Harbor and Okinawa.
here are a few screens :
campaign :
mission screen :
loadout :
new loadout screen :
all the extra stuff removed,
doors no longer visible thanks to Peabody,
only two tubes, but 4 reloads for the game's sake for now.
the periscopes stick out of the bottom a bit, but no solution for now.
It is stand alone (I added the version 3.4 of the torpedo mod on top of it)
Peabody fixed the upndwn scope problem and the Damage image from the BIG sub.
Keltos
download link v 1.4 :
http://www.filefront.com/14602335/IJN_Ko_1_4.7z/
or
http://www.mediafire.com/file/mktzcimjvtm/IJN_Ko_1_4.7z
or