As a basis, I took this picture. I'm not saying that this is an exact drawing. This is AU.
It do give the official specs, 50 meters (manufacturer give 50< so it is a little less then 50 meters). I know this is AU, but if you name it A26 (well A-26) and copy it then you should stay in specs. But that's just my opinion, it is good drawing.
One more thing, the pic you use have a error. There is no support for towed sonar.