Any advice on creating a long scrolling technical document?

Hello,

I am requesting some guidance if anyone within the community has any experience with creating very long scrolling documents.

My client is a geologist who is wanting a solution for creating and sharing with his clients a visual record of the drill core that has been photographed and logged.

He is wanting a solution where he can share the created document with his clients, to be viewed on screen, either laptop or phone etc.

The document will have a continuous image of small sample chip trays laid out in succession, (which could be 200 metres + long in terms of length at its actual size!) but he also wants the ability to zoom in on the samples to see the individual grains, which means the document itself will need to be even larger to avoid pixelation. Ideally he also wants to be able to display columns of technical data relating to the chip samples along side.

He is saying that he would like a final output like a pdf that he can just export and share with the client to view, so he doesn't need to continue to hold their data. There is another software solution that he is currently using that captures and displays the photos in succession alongside technical data, but in order for him to share this with clients he has to provide them with a link and login to view the images and data within the software itself, requiring him to continue to pay for access to very expensive software. It does not allow him to export the images in data in a format that would allowing viewing without logging into the Web based data base, hence the reason he is seeking an alternative solution. 

I have been investigating maximum pdf lengths for creating/exporting pdfs within Adobe express which is what I am currently using, and have been told photoshop may also be useful, but I was just wondering if anyone here has had experience creating and sharing similar long technical documents regarding limitations, or whether this is even  practically or technically possible. I would hate to get halfway through creating such a large document and hit a wall of limits, or get to the exporting/sharing stage and find there are unexpected technicalities which make sharing the final output impossible.

Alternatively, my investigations have also pointed me towards Adobe Captivate for creating and sharing long scrolling documents, which could be an interesting solution for creating and sharing technical content within a LMS type environment, but again with this solution he would need to keep paying for access to the software so that his clients can access the images. He much prefers a final output solution where he can ultimately share a file and be done with it.

Would love any advice (or warnings!) on the best way to proceed.

TIA and regards,

Shelley