Several years ago, I've been cooperating with DraftCAD Services LLC from Long Island, US as freelance drafting support with the projects. I worked with updating, correcting, remaking, refreshing and changing different drawings.
I had to learn the imperial style of technical drawing and using imperial units to do my job properly. It was pretty challenging for me as European, imperial units are difficult to understand... but it was something new for me and very interesting experience! :)
Please find small example of the concrete plate I have designed for DraftCAD LCC.