The iDrawnics.com site has been updated and the plugin works with Sketchup 2013 and later. The iDrawnics plugin is free and no longer has a time limit. Components that work with the plugin are offered in the iDrawnics Store. There is a free practice kit as well.
iDrawnics is designed for the mechanical contractor who doesn't have or need a high end 3D CAD program and doesn't have the time to master one. Currently it is targeted at residential and small commercial mechanical rooms but will be expanded.
A DIY package will soon be available for those who want to create there own components and apply the iDrawnics features. There will also be an opportunity for users to submit their iDrawnics enabled drawings for inclusion in the iDrawnics Store with revenue sharing.