Brach Models has already released three of the German Somua MCG S307 conversions - Pak 40 7.5cm, Munitions Zugkraftwagen and the later version of the Reihenwerfer. They’ve been in their catalog for over 10 years. Not sure why they finally got around to releasing this early version of the Reihenwerfer, but I’m glad they have so I can add this to the collections. They are amazing kits, as are all of Brach’s kits. The later version of the Reihenwerfer that they released in 2012 was one of the first kits to cast metal (tubes for the mortars) directly as part of the resin mortars themselves. Not sure why they didn’t do that here, but it looks like perhaps the tubes are 3D printed instead.
As for the other German conversions, DES Kit does the APC Pioneer and “Stuka-Zu-Fuss” versions of the S307 MCG as well as the S303 MCL Raketenwerfer. And of course all the original French versions.