How much they could have possibly saved, considering also the expensive skilled labor to install it? £100 on a £2000 kitchen?

looks like a minecraft house. Honestly, that might do well with some people. If you were blind or hard of vision, it would be very easy to navigate by feel and memory.

This could work as an aesthetic choice but you'd have to finish it really well in order for it to last and for you to be able to keep it clean. Buying normal cupboards would probably be easier and cheaper.

When your fire insurance is worth more than your house.

This looks substantially better than my current living arrangement