: Thanks for the idea. The chines of an sof is not exactly a thin line but more
: a thin surface `5/8". So, some fudging would occur. I suppose if the
: panels don't quite line up, fiberglass filets would hide the mistakes?

: sing

on the paper, put a pc of scrap ply or card say 4"x4" and w/ a onesided sharpenedd pencil or same setup marker run along the flat of the adjacent sof panel and mark the u/s of the paper. that'll give the intersections as if they were razor sharp.