Actual progress has commenced with the cutting and mitering of some of the pieces. I am using a home made mitre block which I have dialed in to be sure the cuts are precisely 45 deg. I made a test join with a couple of scrap pieces to see how the join came out and I am happy with it. I tried to pull them apart with my hands but failed and had to give quite a hard knock with a hammer, so the joins will be strong.