The CFR505 does look nice and (IMHO) has quute densible geometry, however it's been reported online that they will no longer sell these to individuals. Apparently, all production is now going to a (US-based?) reseller, or was not long ago. There was discussion about this somewhere in a thread hundreds of pages long at a forum a few months ago, however I can't remember which forum - there are numerous similar discussions around the net. There are many other carbon gravel frames available ex-China, but most have dropped chainstays which limit gearing significantly unless you want to run 1x.
If you know exactly what you want, know how to read a drawing, and if titanium appeals, then I can recommend Waltly; they do very nice work at a very reasonable price for a custom and (pre-COVID) were pretty quick - about four weeks to deliver after the final drawing was approved.
Best of luck,
Stephen