That is looking very good Graham.
I know that you have the IP Burner for comparision, and here is my other Meths Burner for comparision as well..

This uses some silicone tube on the pipe which is mounted sideways to allow you to fill up the Meths by syringe, and is held to the rear dragbeam with a threaded stud (which is drilled in the centre for venting), and a nut & washer. This stud is slightly larger than the IP one so a bit more filing of the slot in the dragbeam is required.
Are you going to make a deflector for the front of this burner to even out the flame pattern whilst running outdoors?