They constructed a rolltop desk on the woodsmithshop TV show, episode 611. The plans are available for free on their website woodsmithshop.com. select episode previews and then browse the episodes. You will have to sign up for their weekly etip but I find these emails useful anyway. The episode preview includes a downloadable PDF file that has instructions on how they cut the slot for the tambour door using a template they built. There are a lot of useful router tips on this site as well and no, I am not associated with this program.