The timber is NZ Rimu, from a 100 year old (+) farm shed. The frame was made by request for a customer (BTW, a lady) who described something similar to this (we have made them before, but not kwite as big).
The picture (cibochrome) is from Kweensland Autralia (it is the ocean).
The trickiest part is figuring out how wide the inside frame is, after that it is plain sailing. This frame took only 1 1/2 hours to make and is oiled with a linseed (raw) and waxed with a Teak wax (yummy smell, not so tasty). We are going to introduce a range of ready-mades made like this.