A Pre-Fab Scratch

[Sir_Prize]

Evening all...
Too tired to get off this one track I'm on...
What side would I scribe of a sheet of Evergreen Styrene
"Metal Siding"to make a window? Or do I just make the "X" cut
for the window and carefully push the resulting triangles
(as much as possible) straight back?

I'm sure ya'll talked about it...
I'm just to dern tired ta hunt fer it rite now...

Thanks.

 

[leghome]

My thinking because I have never done this wouold be to scribe it on the outside so it would give a clean appearance to the break. I have carefully used my exacto knife to cut all the way through but keeping it straight is a hard job .