The slow motion video is actually nail-biting stuff. The centre column is a key component of MAST and contains the main current drive solenoid. It also has space for cooling channels and plasma shaping coils.
The units for power density are W/mˆ3, is there a sensible measure for “tech density” maybe $/mˆ3? The so-called ‘million $ kebab’ seems to be following the fusion tradition of remarkable amounts of tech crammed into tight spaces.
Here’s the video