You can download the Mcedit filter here: http://sethbling.com/media/5250/structurespawner2.py

When you spawn there is a big box thing that I put the structure spawning thing so don't think it is am error when you try and there is no box

to install the shcematic watch this video its is not mine: http://www.youtube.com/watch?v=4vrod2E001c

download MCEDIT here : www.mcedit.net/