Help with using X-Carve, Easel etc

So I am fairly comfortable using Sketchup to create my designs (They need to be precise on sizing) but have yet been able to figure a way to get those designs into easel. I am not locked into sketchup but for now free software is a big advantage for me. I am also not opposed to using a string of different programs to convert file types. More or less I need to be able to create a drawing with exact measurements and cut it on the x-carve.

Any Suggestions?