Actually I don’t think the 18.5" x 10" is the typo. I think the Typo is the 20"x18" working bed. @dan or @bailey can you confirm?
Also @dan, since you are dealing with engineers and makers, it might be best to keep the same order in your measurements. Meaning, can you switch the 11.5"x20.4" to be 20.4"x11.5" instead to keep consistency? My brain did a little flip when I came across that.
EDIT: Actually, now that I look at it, is the 20.4" for cuts also a typo? If the working bed largest dimension is 20", how do we get 20.4" of cut space?
Further Edit: I’ve now caught up on the updates and have seen the http://community.glowforge.com/t/specs-update/ post. Things make a little more sense. Still trying to figure out how we get 20.4" of cutting space from an area that is 20" Wide.