they have , its call windows that open ???.
going by what I have seen on the videos they are having trouble fitting thing than need to make it go and stop never mind fancy bits like heating and cooling , sorry the heating is already in the exhaust ???

Air-con will be fitted later, they need to fit the Turbo and other ancillaries yet, I reckon the air on system will either be fitted or rejected depending on space after that.

need to fit the water pump before all of that, then you get to think about weather the AC will fit. after that most people think about turbos but this is BOM and turbos come first, so does tea to think of another way around this

Actually, I think a LOT of alcohol came first, this just reeks if 'I've had an idea... it's a good one...'