I'm trying to scale my viewport using engineer's scale (i.e. 1:100 - 1" = 100') and it doesn't work properly. The paper space is scaled at 1:1 and model space is scaled at 1. When I size the page to 11x17, then try and scale a view port using engineer's scale, the viewport blows up way beyond the paper space. I did a little test and sized 1", 2", 3", 4" etc. in paper space, then tried to match a custom scale to that and I was able to just do my own custom scale to 1" = 100', but why is this not working when I try and do that scale in the viewport?

Thanks!