Custom Water Tank for Fortuner

[Defenderman]

Has anyone fitted a custom made water tank in the recess of the Fortuner boot & partially below the rear seat. This appears to be an excellent place to stow a water tank as it has a reasonable volume, is out of the way (only using redundant space - especially if a drawer system is fitted), and is located in the lowest possible place in the vehicle thus minimising the impact on the Centre of Gravity.

Would appreciate hearing your opinions.