I've written a new version of my Schematic To Command Block utility for Minecraft 1.13. This utility can take .nbt structure files generate by Minecraft 1.13, or .schematic files from MCEdit or other utilities for Minecraft 1.12 or earlier, and convert those structures into a series of Minecraft commands that can be run in command blocks, which will recreate the structure in Minecraft 1.13. This is useful if you want to copy a structure from one 1.13 world to another or from earlier world into a 1.13 world and you don't have access to the world files but do have access to command blocks.
I've made a few fixes and released a new version - S2CB 1.13c is now available! https://github.com/TroZ/s2cb/releases
This fixes issues with sugar cane, nether portals, custom named items inside inventories, custom named mobs as passengers of other entities, experience orbs, and some additional minor fixes. It also adds an option to include projectiles, which were previously not reproduced.