Hello,
I know this is not a traditional adventure game and it only runs on Windows but the 1998 game Larry's Casino has had much of its resource format reverse engineered and extracted in terms of sprites, UI elements and audio.
I couldn't have done this effort without the help of @doomlazer who was kind of enough to contribute time, energy and code to the effort and additionally was solely responsible for all the audio extraction effort which he previously did in his TrivialQuest project found here:
https://github.com/Doomlazer/TrivialQuestThis reverse engineering effort was written in Python3 and as it stands still needs some effort to get the game backgrounds extracted to be 100% completed.
Please see the project here:
https://github.com/deckarep/laffer-casino-extractorBtw, although Larry's Casino is not an adventure game, buried within the binary are many references to SCI components and namespaces. It has many concepts related to SCI and seems to have some degree of the engine baked within it which is why I've added it under this forum category.
If anyone wants to take a crack at extracting the backgrounds, please submit a pull-request to the project. To get started all you need is the original game's RESOURCE.VOL and RESOURCE.AUD files.