Hi Tony
I am also researching into this subject, as i have an old tamiya panzer iv H that i am planning to rebuild...the schurzen is missing too!
IMHO, its quite plausible to have a panzer iv H without the side schurzen, but as Jon pointed out, you have to include the mounting brackets. I believe those are installed at the factory. It also seems that all version H have the turret schurzen mounted at all times.
Since mine is missing the side schurzen (I still have the parts for turret schurzen and side mounting brackets), I may either go for a version H, or I might want to just drop the schurzen altogether and backdate it to a late version G...
Cheers!
Lawrence