I've updated SimpleWorlds and added world exporting to the MCPE format. Now you can play your world built in multiplayer on your device, or distribute it to the community.
To do so, update SimpleWorlds, load your level, and execute (as OP or console):
/swe worldName, where worldName is your level name. It will be converted and saved into plugins/SimpleWorlds/export/worldName/
Outdated SimpleWorlds 0.3.1
Manage the MultiWorld system easily, load worlds on runtime, and export them.