Hi there, feel free to make it as it suits your desires !
You can check out how i used it here : https://www.twitch.tv/videos/2064602313

The Orignal idea was to do a classic BuildBattle but I made a twitst where it's made for duos and so u have each 1min 30s to build and swap in a 6 min clock. I set some panels to help you figure it out. Also there is a barrier protection to stuck people in. Those command blocks are bellow the arenas.
Think about turning on command blocks and to turn off the spawn protection if you want an none OP player to be able to click any button.


Features : Randomiser for themes / Timer / Player and Spectator separation / Borders to boxes / build reset at launch / tp / etc

Also massive shoutout to GoggleD0GG who made the orignal map here : https://www.planetminecraft.com/project/f2u-build-battle-pvp-arena/

If you have any question i'll be glad to answer them.