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Hi, your Zeiss Ideal 111 is actually a 6.5x9cm film size. It uses a
somewhat uncommon series of holders also used on the Zeiss Juwel--they
"pop off" rather than slide off, unlike most other German plate cameras.

I do not know if a 120 rollfilm holder was ever made for this camera.
eBay currently shows a listing for several glass plate holders for the
Ideal 111, but 6.5x9cm sheet film is quite limited, and you will also need
film sheaths to hold it in the glass plate holders. I think 6.5x9cm sheet
film is still available in Germany, but not the US, as far as I know.
(Freestyle used to carry it.)

You may also find 6.5x9cm film pack holders on the used market. Film
packs are no longer available, but others have repurposed the film pack
holders as ground glass holders. (It MIGHT be possible to adapt one of
the more common 120 rollfilm holders to a film pack holder; I don't know
for sure if this is practical.)

Sorry I can't help with the ground glass problem. --Leigh.

PS: I like using these old cameras, and most are still fairly inexpensive.
I'd suggest instead looking for a 6.5x9cm Kodak/Nagel Recomar,
Voigtlander Avus or Ica/Zeiss Maximar they , as all use the same fairly
common holders, including for 120 rollfilm. All three were also available
in 9x12cm size, and 120 rollfilm holders are also fairly common for the
larger size.

These older 120 rollfilm holders don't have the best film support, so
results may not be quite as good as a more modern rollfilm camera