I would personally ask someone like dovebiker nicely to help me out and buy direct from China.
I approached the chinese manufacturers with what I thought I wanted, and got some great prices. However there is a massive number of choices to make and little details, the manufacturers don’t really guide you through them and sometime behave a little erratically when pestered with questions.
Ideally you would point at one of their efforts (ideally hook up with someone who bought one and try it) and say “make one like that” but with your preferred angles. They are not going to help you out with choosing angles – you need to do that by copying from a bike you like / guidance from someone in the know – being able to stitch tubes together is only half the job.
I ended up finding my perfect ti frame “off the peg” in a Charge Plug 5 ti frameset ex demo. It has the angles I was looking for, discs, clearance for big tyres, full mounts, double butted tubing for a lively ride. OK the dropouts aren’t as nice as I would have specced but I knew the bike would work – and it turned up cheaper than a custom frame and with a UK warranty.