Chris Vernell
45.29 N, 75.75 W

Visited hobby shop this morning. Materials purchased. Now to find concurrent time and energy 

I got some similar in my Tool Box so are available in UK, though where from? Had them a long long time.I bought these "miniature brass bar clamps" from my favourite woodworking hardware pusher years ago. Great for projects where full-size clamps would be overkill.
That's why I epoxied the ABS angle to the bottom of the walls, but it might indeed be a good idea to have feet as well to keep it off the planks.That is looking good.
Might be worth putting some waterproof feet on it so it is not resting on a damp surface all its life.
Looking good thereAnd the two ends.
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If only to prove to myself that I've done it.