I'm actually in the process of doing that right now. All the mob spawned in the overworld that I make suck so hopefully I can get a good Xp farm in the end.
I flooded my end... the rates are awesome but there is a 55 hostile mob cap. Also when push comes to shove they will teleport thru and onto water blocks to get away... So the only way to make a fully efficient farm will be making everything around the spawn platform "the void" all within a 32 block radius (I tested it)... they will not be able to teleport to structures that are further out than 32. So if all there is is void.. then they have nowhere to go!.... Bwahahaha!!
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Stay fluffy~
No need to overcomplicate something simple.
Stay fluffy~
The build limit extends out that far.
Anything beyond that (or some number very close) refuses to be placed.
Stay fluffy~