Following some final adjustments to the deck sections (some time ago, I accidentally broke the deck into two pieces by dropping it onto a quarry tile floor!), I have now got the fit to my liking and have made a final dry run with the assembly. Now it's take a deep breath and fix it in place on top of the pillars, permanently. I've not quite decided on the best adhesive, yet. The options appear to be PVA, Uhu or epoxy. The deck is wood and the pillars a mix of wood and plastic, on the contact areas.

Here are a few rather poor quality photos of the deck in place. I think more lighting or the flash would have been beneficial!

First, a plan view. Some of the cross beams are missing and will be added once the main longitudinals are fixed

Some views from the front.

Mmmm! That angle-poise lamp does look a bit out of scale!