Hello,
I have a neighbour that after 40 years in welding / fabrication is setting up on his own. He made my tank cage for my new van. I was quoted £390 for a galvanised cage from a known supplier and he made it for £120.
You have a choice of bare metal, primed and painted or galvanised.

I had mine painted to match my van, it was a 350ltr upright tank.
So if anyone wants anything making email me and I will sort a price.
Cheers jay