That's a nice set of build photos. What I like about your box building method is all the nicely rounded corners. The box looks very sturdy as well, but I wonder if you might have overdone it with all the bracing under the sound board. Maybe on your next build you can try to at least "thin down" all that bracing. Most my instruments (which use 2mm plywood veneer for the sound and back boards) don't use much bracing unless I am mounting the tail block (i.e. bridge with built in tail block) to the top side of the sound board like on a ukulele). So, with 3mm plywood sound and back boards, you shuildn't need any bracing at all. Believe me, it simplifies the build.
I also like the flush mounted sound board idea, because it would hide the ugly sides of the 2mm plywood veneer that I use on my instruments. One reason I paint some of my instrument bodies black is to hide the unsightly edges of plywood veneer. On solid wood, this wouldn't be a problem, but I have yet to locate a source in China for 12" x 10" (or similar) pieces of 2mm would. I'd be even willing to by it in large 6' x 4' dimensions and cut it down. (Also, one reason is my language barrier... I tend to buy what ever I can find on hand at various 'Mom and Pop' wood supply shops).
Well, I hope your project turns out well. I took the liberty of taking 2 of your photos and re-formatting them into one to show our reader's the box we're talking about so they don't have to bother following all the links to your hi-res photos.
The build tuned out real nice. The headstock design is great. Maybe you should do a photo series & write-up on how to build a headstock like the one on this instrument and post somewhere on CBN.
When you take photos using digital cameras the resolution is actually too high for convenient use on blogs / websites like CBN. So the thing I usually do is to use a photo viewer to view the picture (near) full screen and then (on my PC) do a Ctrl-Alt-PrtScrn to cut the image shown on-screen to the cut & paste buffer and then go into MS Paint and do a Ctrl-V to paste the image into MS Paint. Then, after editing out the parts of the screen image I don't want, I save the image and it will be saved in the resolution somewhat less than the resolution of your screen; cutting down the size of the image file to something more easily handled by CBN (smaller image file sizes and faster loading). Save using the file type ".JPG" (a few other image file types may able work but I generally use .JPG).
Then when adding a comment on CBN, use the "Image" icon on the menu bar of the comment editor to upload and display the image in your comment. It's the second button from the left. Clicking it will display a new dialog box called "Add Image" with two tabs: "From My Computer" and "From a URL". Use "From My Computer". I generally save the images to be uploaded on my desktop to make them easy to find, but if you save them elsewhere, you'll have to navigate through your directory to locate the file. The other options on the "From My Computer" tab page don't matter much, so use the defaults. When you click on "OK", the photo should appear in your comment. Do it a few times and you'll be an expert as it really is pretty easy to do. Here's your 3 new photos...