Do you ever find what you were looking for after you settled for something else?
A couple of years ago I needed a precision straight edge and triangle to setup a Felder combination machine. I wanted a triangle more than a framing square for a couple of reasons: 1) It's much more likely that a triangle will stay square if it gets bumped or dropped and 2) Triangles have a built in 45 degree reference which I would use.
Unfortunately, I couldn't find a large triangle. I ended up getting Woodpeckers one-time-tool 16" x 26" framing square. The framing square isn't bad; it's just not as useful as a triangle.
This is the triangle I really wanted. I didn't find it on my original search.
The dilemma: should I sell my square and get the triangle?