I'm not sure about you guys, but I'm not getting any feedback whatsoever. I've measured it with all the tools I can find, but I'm not getting any "Well done" or any link to the next level. Any thoughts?
You need to use the tools provided to create something that is guaranteed to be what is asked for.
For instance in the first level you aren't given a ruler, so you need to figure out how to do the level without using one.