I have bought titanium clone Brompton frames twice from two different suppliers, but didn't keep any of them in the end.
In general, the quality seemed OK, but, the problem is the tolerances. One frame can't fold the stem into the 100% correct position, the other has a problem at the rear damper bracket.

I know the authentic Brompton frame could also have similar issues, but these third party stuff sometimes are unpredictable.
Or perhaps I was just unlucky？


Anyway, nice build! Impressive weight!

But I do not recommend others to follow.