Thanks James and Leon!
I'm guessing your concrete cube is larger than mine is going to be James, due to me not owning the house and making it easy to hide the fact it was ever there (I'd never attempt to dig the entire thing out). I have some weld mesh here, I like your idea, make a smaller cube from the weld mesh and a template.
Ah, easier to tack the galvanised rod to the rebar than the stainless steel bar but I'll just use tie wire or buy galvanised rod.
While I mentioned my pit was 600 deep it's actually closer to 750 to allow for gravel and concrete powder to try and prevent the clay drawing the moisture from my concrete too fast as it sets.
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