Hey guys! This is a first for me so I thought I'd document the process a bit and do a build-along I hope that others might find something useful in here, there will be a few challenges along the way and it's great to have others along for the ride. Please do not be shy! Sometimes I skip over important details by mistake, so any and all questions and comments are very welcome. This guitar body will be shaped like a Jazzmaster and routed for all standard USA Jazzmaster appointments. But the general principles could conceivably apply to all kinds of instruments, maybe even 335-style shapes with a fully carved top and back! So take from it what you will. The challenge is how to achieve the top and back contours with a hollow / Thinline construction. I've done one OR the other before as a Thinline, basically machining the body core in 3D inside and out, and capping it off with my standard 1/4" marine birch ply top (for belly cut) or back (for arm contour). This Thinline had a belly contour and shows the process pretty nicely: Here's the inside of the body core (before cutting the belly contour on the outside). You can see I've extracted the shape of the belly cut and used it for the inside cavity cut, so that the cut leaves a consistent 1/4" back thickness. Then I cut the corresponding contour in the back Here's the top, with reference holes to glue to the core so the f-hole and control cavities are in the right place And here's the whole thing clamped up and gluing the top to the back. After this stage, I simply line up the reference holes with the bed and cut the body from the front as usual.