The one that I bought is designed to stand 800mm high which seemed a good working height. However, after consideration, I assembled it at 400mm high and about twice as long (4000mm).

I’m really pleased with it. It’s now planted up with strawberries and I do keep it weed-free and runner-free.
One mod that I made was to fit 3 dexion frames at intermediate positions to increase stability.
The smaller wooden bed is made from some 9” x 3” oak sections enjoying a second life, to see how that fares.

This later photo taken today shows the raised beds made from 6” x 2” plastic sections which are bedded on lightweight concrete blocks. This structure is not going to rot. However, the plastic sections are a lot more flexible tha timber sections and expansion causes them to spread under the lateral soil load and they even walk a bit. Also the plastic costs a fortune. I was given it but it would have cost me say £500.