Watson, that is stunning! Love those colours!
I'm personally not a fan of all over quilting for a beautiful piece like that. I love my bright colours, and I like to see how much I can make them pop!
How comfortable are you doing FMQ? Or even using your walking foot?
Me? Now, we all know I'm a bit nuts (I'm the one currently doing an applique with 497 pieces LOL) but I would do three loops in each triangle (goose) using matching thread and SITD on the black part of the triangle.
For the borders I would do a square on point with another square not on point on the inside … Your "points" would join across the borders …
Have fun, and I'm sure whatever you do, will make it fabulous!