Thank you all. I too found the varient odd and unique which got me wanting to build it. Not much online about the history of these unique tanks. Bish found the same thing I did on history of these tanks. Like a lot of stuff during that time, the Germans would try anything to solve a problem.
If you decide you want to build a slipper tank 190, I did see these tanks offered as an aftermarket add on to 190 kits. You may be better off building a different well molded 190 kit and adding the aftermarket tanks. This kit like many dragon kits had weird seam lines in hard to reach places.
I traded for the kit with a friend at my local model club stricky off the box art of the slipper tank varient.