Go to Wickes and get an 8ft length of 63m x 34mm studding. Clamp it down and get out the router fitted with a half-rounding bit.

Cut along one corner.

Set Table saw to chop out a rebate 12mm wide and 47mm deep.
Here I've done the shallow cut. I did the deep one in two passes, increasing the blade depth for the second.
My table saw is strictly the cheapo DIY variety. If you have pro kit you would do it in one.

Slightly out-of-focus results.

The bit that came out of the rebate ripped down to 35mm. This will be the spacer in the frame.

After this I roughed up the outer surfaces with a wire brush to give the 'driftwood' effect.
I have the frame assembled and working on the finish.
Watch this space.....
