Mark; Gee, I thought I had this question nailed, but alas, my
Skoda Heavy Guns by Michal Prasil, Schiffer Publishing, has failed me. While it lists the 22cm model 32, there aren't any drawings or photos, sorry!
I've got plenty of info on the Skoda 24cm cannon, 38cm howitzer and the 42cm howitzer, including very good drawings, if you want those.