I got one of the Wasserfalls at the Crewe show: nice little kit.
Having read up on the missile, I've kind of gone off the tracked TEL idea for a couple of reasons:
1. Wasserfall launched from a free-standing position and was stable in 35mph winds, so it didn't need a rail and/or vehicle to hold it up.
2. It was liquid fuelled using hypergolic propellants, so given the relatively high risk of getting a huge explosion instead of a launch (due to dodgy slave-labour late-war production standards), you'd want as few people and hardware near it as possible at the moment you pushed the button.
So what I'm thinking about now is two Sdkfz.7 half-tracks:
1. a standard artillery tractor towing the missile on a skeletal transporter/erector trailer,
2. a flat-bed flakwagon with the AAA mount replaced by the missile's visual director, which I'm presuming would look something like the Enzian's, i.e. a rotating/elevating frame holding two "deck chairs", binoculars and black boxes.