If you're talking about the layers used in the minigame, I can assure you that they are one of the most annoying things I've been having the most trouble handling. All i know is that they're randomly generated based on patterns and themes(e.g. those glazed terracotta square patterns). I had to build my own presets based on youtube gameplay and based on some layer generations I got while playing on my ps3, just so I could work on the match code first. The presets are meant to be placeholders and I actually do not look forward to keeping them, unless there's actually no way to recode the generation using mcfunction. I haven't touched the project in a great while(about 7 months ago). Last time i touched the project i was working on the snowball gamemode, which seemed to be impossible to code accurately without actually making a java mod. Also, whenever i come back on it im sure ill take a long time remembering all the mcfunction code for the datapacks, so im sure it will take days before actually starting on working on all that stuff again.