I want to build a huge catedral but I need 2 plots to make them, also I don't have permission to use/p merge, so i request help from some mod to help me whit this little problem, thank you for reading!!.
Use a bigger world. We don't allow plot merging but there are 3 world sizes to choose from, the largest being 201x201 plot sizes should should be plenty. If it's bigger than that you're just gonna need to scale it down.