Yes, the cabinet guy can make the 1299 in bamboo. I'm not sure how much it would cost though, likely similar to the 1099. It always depends on how many rips they can get out of a sheet. Once you get over about 16" wide, you can no longer get 3 rips out of a sheet when you figure in the width of the router bit. Or when it works out to where there's only 6"-7" or so left, then it's basically wasted wood, but still has to be recovered in the cabinet price.
The only issue I see would be the 'waterfall' look when the bamboo is miter folded to make the box. The 1099 is about 36" tall. So 36" + 36" = 72". That leaves 24" to easily make the top panel and get a full 'waterfall' look, except the bottom that no one sees. On the 1299, if it was 40" tall, we'd be looking at side, top, side being a 95" section. That's really pushing it on a 96" rip. I'll need to check with the cabinet guy about that one.