Illustrator.

Based on the existing typeface, Century Gothic, as I wanted a very round, bold, smooth finish. And also more of an area to work with.

I haven't stuck exactly to what I was doing with the books, I have added more lines simply to make the letters more legible. 

I've been thinking about audience too. I think this typeface would be most suitable for designers, or more specifically architects, or just simply anyone who works with technical drawings.