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I dug one about two years ago. I think I broadly followed the wildlife trusts guide.
It's quite small, about 1.2m by 80cm. I used an underlay as well as a water proof pond liner because some guides recommended that. Not sure how necessary the underlay was, but didn't add much to the cost, the liner is the expensive bit.
It's been great, has attracted some frogs and the birds like having a bath in it.
These guys are great for native plants. They tell you which ones are oxygenating, how deep they should go etc.
Thanks will take a look at those videos then, and will post photos as we go. Hopefully start this weekend if the weather is kind.