There aren’t many that offer complete kits. DM makes good stuff. The communication isn’t very good for most people. I get fairly decent replies, but I s been working with him for years on getting stuff done. Nothing comes quick, either. DM does some questionable things, like a spacer after the last baffle in some kits. I could’ve requested him do it different, but just told him the dimensions I wanted.
I think Nick @ ECCO does the best work, no doubt. But I don’t think he offer kits at the moment.
I’ve never ordered a kit from anybody else. I’ve had some pieces made locally, and bought tubes from other places, as well as having tubes turned down elsewhere.