Hi,
The reference site for "LZ-129 Hindenburg free download" has always been:
Papírové modelářství CZ :: Zobrazit téma - LZ-129 Hindenburg a jiné / Alin / 1:200
At that site the same author "Alin" provides the site for download.
It is a file over 25 MB.
It is an exceptional model and also large enough scale.
Orazio