That sounds about right. Just to ck things out, put the lens at it's closest focus distance and use a measuring tape to measure the distance from the object you are measuring from to the camera's film plane (about 1/2" from the very back of the camera). If it roughly agrees, load some film into it and shoot. These are such great cameras for those old lenses. You have a very good lens on it already, but there shouldn't be any problems finding affordable lenses for your camera.
If the camera digs into your back when it's on a strap, the optional grip will fix that. The shutters are metal and a tad bit noisy, but if you put the camera into a half case it is nicely muffled. Of course, if you have a grip on the camera, then you can't use the half case........