WWI german sub - U-9

[the black knight]

we all know of the fame and expliots of the WWI u-boat U-9. i am wanting to model this boat in 1/32nd scale and i know that she was part of the u-9 class which included U-10 and U-11 u-boats. ive tried finding plans of the boat, but it no may be too early of a u-boat to find accurate plans. if you guys know where i can find plans of her, please let me know.
Thanks.