Hello,
I may have found a bug in your DrawAlong tool. I have a JPG image that I'm adding countours to. I'm drawing them in the negative direction or below the image. When I type 6' .8", it draws a line not on the blue axis and at an angle towards the corner of the image. Trying to narrow down the error, 6' 1.8" works fine as does 6' 0.8". Very minor and easy to workaround but thought I'd share.
Amazing work!