imagine if plugin Residence (free version available on premium page description) could allow players to let certain web players be able to build in certain residence areas or subzones..
orr if i could specify in config an area where web players can build...
orr if i could let web players choose areas to build in and let them log in later to regain access
https://www.spigotmc.org/resources/residence-1-7-10-up-to-1-12.11480/ http://ltcraft.lt/Residence/
Interesting idea from https://github.com/satoshinm/WebSandboxMC/issues/70#issuecomment-304364709: