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We size the transformer bund to contain a 26.5° oil spray from the top of the tank, radiator, bushing turrets, and the bottom outlet from the conservator. CIGRE brochure 537 says a spray angle of 30° from vertical is commonly used. Looking at your drawing, oil from the radiator could spray...

We use VRLA banks for 125 V protection in substations, typically either Exide Absolyte GP or Enersys SuperSafe TM.

Looks like GE Vernova has 24 kV up to 4000 A, if you are ok with vertical break.

As I believe you are in NZ, you could use the transmission company's service specification 07.23 (Work site and Mobile Plant temporary earthing and equipotential bonding of transmission lines) as a starting point.

Class 2B is standard/free fit for internal threads. See here or here.

I believe multiple single-point grounding can also be called sectionalised single point bonding, please see Figure 2.4 from CIGRE TB 797 below: The sheath voltage limiter is essentially 'open', like a surge arrestor, so only one end of the cable is directly grounded. The sheath/shield is not...