Hey Peter, i'm sure your work is beautiful, but here is my M2C...
I'm sure the more "experienced" (read ol'timers) members will give better answers, but the beauty of scrolling to me is that the piece, or the majority of the piece is whole, not a bunch of parts glued to a backer.
If you wanted to just glue a bunch of pieces to a backer, why do you need a scrollsaw, or why do you need to drill a bunch of starter holes. You could just use any other saw an cut your pieces out and glue them where you want. I think the challenge and beauty of scrolling is cutting an image out of 1 piece of wood.
There are other means, like Intarsia, that use many pieces of wood and turn out works of art. Take a look at some of Al's work. But for scrolling I think it should be 1 piece or close to that, just my thoughts.
Still would like to see your work