Hi Daniel,
Thanks for inviting me for your project.
I understand your project. I'm interested in your project.
I have developed very fast, configurable, flexible and easy to maintain linux based kiosk three times here. Kiosk simply runs in Firefox web browser in Ubuntu Linux, making it extremely usable to display webpages hosted from a local or remote server. Kiosk addon is OS independent.
I'm giving links of two projects here. In these kiosk user not able to use any commands or shortcut or right click menu or ctrl + alt + del and forcefully killing kiosk firefox led to system restart and again automatically executes kiosk firefox, foolproof. And admin can manager kiosk remotely from server.
I developed the same kiosk project (Firefox + Ubuntu) two times here:
1) https://www.freelancer.com/projects/1671049.html
2) https://www.freelancer.com/projects/Firefox/FireFox-add-title-menu-scroll.html
and you can check the description, I did the same project there. I can build a solution with dedicated firefox addon which will restrict to full screen and your users might not even notice they are using Firefox :)
I'm a Firefox & Chrome extension developer. You can check my profile to view my expertise in Firefox and Chrome extension development.
Please shoot me a message so that I can show you my portfolio related to browser extension development so that you can judge yourself whether I'm suitable for your project or not.
Regards
Hemant Pawar