I've been thinking about making a server without any plugins but with command blocks. I made a lobby but I have an idea in The Test Zone. It's a map for redstone testing & command testing. But I also made it so that it can be useful for Server_Prompt's. This idea is specifically mine and i'm thinking about making a build battle map out of it. This might also help you with server's and I plan on making new code and setting up gamerules once the player spawns in the lobby. I set up a pressure plate on the spawn point for a trigger and I also set up trigger commands+gamerules to the map. I made as well as my own trigger commands using the objectives and I made a gui to the Map. This Test Zone will be a test for all minigames but I know about the difficulty of that and I prepared for it: I have done commands & im not afraid of using tutorials to help me.
I've been playing MineCraft for years ever since 2015 & now i'm going to try to make a map for a server without plugins. I know maps arent technically a server, but you can install the Vanilla map onto the server and I like new challenges. I know that there might be problems when you dont use plugins, but I really think it would be neat if I did my own code for once.