On A3 should be readable. If not readable add split drawings to more than one sheet. Name drawing E-ISO-1, E-ISO-3 etc so that everyone can easy know it is isometric.
Add part marks.
Do not show purlins
Today me, client and fabricator spent a lot of time on on quote No https://tek1-quotes.herokuapp.com/quotes/3687 trying to identify drawing nos on the Iso metric drawing.
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