I am getting confused on your requirements. Initially you said:
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I would like to know if it is possible to create a sort of private local cloud so that to be able to access to those files from the locally connected devices (PC with linux and windows, android tablet and smartphone) and possibly being able to get the last read page when changing from a device to the other.
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Moreover it is important to avoid local copies of the files on the reading devices.
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Then you said:
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I would like to have a portable device so that to
1) be able to access the library even where WAN access is not available (train journeys with lot of galleries, beach and so on)
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And finally:
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I would like to have a portable device so that to
1) be able to access the library even where WAN access is not available (train journeys with lot of galleries, beach and so on)
2) avoid to have my pc always on and to open access from the internet to it
3) avoid to have a fix public IP to be reachable from outside the net.
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In order to not have the books locally downloaded to your client reading device, you will have to access them from a server (the "private cloud" that you mentioned). You said you wanted to be able to access the books "where WAN access is not available" and also "avoid to always have my PC on".
I don't understand how you are planning for your client reading device to avoid storing books locally by accessing them from a server instead, but you don't want to run a server, and have all this work without network (WAN) access either.
And this has now confused me further:
Since you mentioned "powerbank", are you planning to run the server on a Raspberry Pi and take the server along with you into the field, running on a powerbank?
Sorry, I'm totally lost now.