So my batch with a double amount of gelatine worked nicely. Pics below.
It holds shape very well when sliced… not quite firm enough to pick up and handle, though that’s not really a goal. I may try another batch with more gelatin just to see how that works out. Now it’s a matter of working out a good flavour!
Despite my fears about air bubbles forming due to whisking the gelatin, the interior looked nice and uniform.