Adapt wont sell frames as one offs.
The LTK 266-d-sl mentioned by @klrdd is 680g weighed the same way (no metal parts) no paint. Those extra 10g also provide compatibility with 35mm knobby tires (probably most 36mm tires will still have over 6mm of clearance). And you can buy one for just around $ 610 USD, plus the cost of paint and shipping, and any accessories you want with the frame.