Hey Alan can I print it out in A4 and use the templates for the right size???
The PDF file is in A4 format (did a test print today) and if you print it with the 'fit to page' setting, you will have an 1:1 scale of the rangefinder (verify the dimension by using a ruler against the check ruler on the right-lower part of the page - the black and white squares). Also use SingleSeat's build thread (you have the link in the first post) for assembly. Good luck!