In reference to the sWS Panzerwerfer '42, yes Italeri made one, I don't know if they are still making one or not. They are available from Squadron and are currently in stock. I would recomend the Royal Mode PE&R set for it, very hard to find and depending on which Royal Model update set you choose, very $$$. If you are unable to find this, I would suggest the Eduard PE set.
In reference to the Opel Maultier Panzerwerfer '42, yes Italeri made one and they are no longer produced. They are posted on eBay on a regular basis, about one every 2 weeks and sell for about $30.00. Again, I would suggest the Royal Mode PE&R set for it or the Eduard.
For those who are looking for better quality, try the Opel Maultier resin upgrade by AirModel. This is also hard to find.
Azimut is also has reported that they will be coming out with a Nebelwerfer turret. Mayby they will come out with the whole kit... To me, they make the best sWS on the market !!
From my knowledge (Which May or may not be right)
To clear things up a bit, the Nebelwerfer had 6 tubes using rocket propelled projectiles (mortars) either 150mm (1941) and later up to 210mm (1942). Originally designed as a towed artillery piece. Later to be mounted on tracked vehicle (Sd.Kfz 4 Opel Maultier) and upgraded to 10 tubes 150mm tubes, and later installed on an sWS. I am not positive that they ever installed a 210mm Nebelwerfer on a vehicle. Lion Roar makes a good standalone model of both versions of the Nebelwerfer.
BTW: The Opel Maultier (Sd.Kfz 4) only carried 20 shells, so these were often seen paired together with muntions carrier's
The Reihenwerfer had 16 rails using 80mm rocket propelled projectiles (mortars). Originally designed as a infantry support vehicle in close support combat on half-track vehicles against infantry.
The Vielfachtwerfer had 24 rails using 80mm rocket propelled projectiles (mortars). Originally designed as a infantry support vehicle in close support combat on half-track vehicles against infantry.
I don't exactly remember where, but do somehow remember seeing a picture of Rommel on inspection of a Reihenwerfer/Vielfachtwerfer doing test firing.
I have also seen a picture of an American T-34 Calliope, 60 tube rocket launcher mounted on a Sd.Kfz 251 Another model that might be of interest.
Since there is a Luft '46, maybe we should make a SS '46