Last night made an easel for 16X20 paper; but when tried to use it the paper was too small. Paper's dimensions were 40X50cm which is about 3/8'' smaller than 16x20''. Do papers vary depending on manufacturer/ country of origin? I used the heavy counter top type of white board ( forgot what its called) and aluminum strips (3/4'' & 1'' wide) in picture frame fashion similiar to a Ganz easel. If paper dimensions do vary, plan to make one side adjustable.