Does anyone know the cost of rubber and foam sheets per pound respectively.?
Green and yellow is internationally recognised as Earth wires. Legislation makes it law that all pipe fittings and large metal fittings are Common Earth Bonded . It is a safety feature so that if a mouse eats the plastic off a live wire somewhere, or a wire is trapped on plumbing, then it ensures that the whole pipe does not become a live conductor. If you were sitting in the bath, and touched a live tap - you would be killed, so this is why they are all bonded to earth as many times as possible. There should also be no accessable switches or plugs in a bathroom. All lights should be switched outside - or on pull switches. The only exception is shaver sockets - which are low voltage.
Look at a Volvo XC70 or a Mitsubishi Outlander. Both are similar to either Subaru but alot more stylish for not much more money.