The sample was fashioned from scrap woods, it's not meant to be a preview of anything other than the overall shape in 3D. I checked your order sheet, and it includes a 7-piece Deluxe Purpleheart and Maple neck, and that will of course be used on your actual bass.
3120 isn't long enough to yield a top and back for your design (it is rather large compared to some other shapes we make. We'll have some more bookmatches up later in the week, and perhaps we'll find a good mate for 3120 or something else that will be appropriate. As for a digital overlay, that's actually not a small amount of work to make it anything close to accurate. Let's find a good canidate for the top and back before we think about doing something like that.
I think that if we decide by the time the bass enters spray that we won't be waiting for the knobs at the end. It's a good idea for you to look at Roger's website and get an idea for shapes and designs. Do you want the knobs to stand out or be more subtle?
Wayne, it might make a nice clock or something, I'm afraid the neck ends about 3 inches past the top edge of the picture, so it sure won't sound very good.