This transformation is the work of Martin Green, and he did all of the work himself apart from the seat. (He persuaded his next door neighbour to help with that!)
The one-off parts fabricated and fitted include (but are certainly not limited to): the seat unit and undertray, fork brace, headlight/ speedo brackets, front number plate, intake scoop, running lights, brake lever pivot etc. etc. Not to mention the hours and hours spent cleaning and polishing the aluminium parts, and prepping the bodywork before applying the final paint.
Martin has written a comprehensive blog detailing the build and it is well worth a read, even if MZs are not your thing, as it contains lots of information on the build process which is not bike specific and might give you some ideas for your own projects. So pop over and read his blog
HERE.
Otherwise, just enjoy looking at the pictures.