Some more remarks about the frame (might not be the last, i'm reviewing every single mm of the frame before doing the final assembly).
Rear disc mounting posts: Not faced. Heavy paint globs on them. Not good as it renders the caliper / disc alignment hard to achieve resulting in sub optimal braking power, uneven brake pad wear & potential disc rub.
The lower downtube cable exit port has sharp edges. This will damage cables in the long run. It might also be a safety issue has you've got the rear brake line exiting here. The cable entry port at the upper end of the tube has a rubber grommet which is good pratice. It'd good to either change this down port to have a grommet or to smooth the sharp edge before it's welded in.
On a side note, It might seem that I ask too much of a Chinese frame manufacturer but Frey seems receptive and willing to improve their products, which is great. We might as well point out all the flaws to them. Plus they are almost charging EU/US prices on the frame so it's not un-reasonable to expect quality to be on par.