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5 Add Glue tabs
Select Plugins>Glue Tab.
glue tab plugin
http://github.com/rschenk/Sketchup-Glue-Tab-Plugin/
Click on boundary edge to add a glue tab.
Click on the tab.
Press "S" key . Scaling grips will appear around the selected tab.
Select a scaling grip and move it to scale the tab.
Scale tool
http://help.sketchup.com/en/article/94900
Scaling 2D surface or image entities
http://help.sketchup.com/en/article/94902