…start with a canvas of 720×534 pixels…
Personal opinion here but I find that, with the excellent way Vegas handles graphics, that’s no longer necessary.
I used to have to do that if I was creating graphics on my dpsVelocity (the procedure was even in the manual).
I now create graphics at 720 x 480, do a “match aspect ratio” (easy to do with a script)on it and I’m done.
I was hesitant at first but, after showing the results to various artists, graphic designers, animators, etc., I have no qualms as a circle comes out looking like a circle 🙂