Bell Boy,
Well you get the ambitious project award, PM me if you want actual cost details for a medical fit on a 412.
Not to sound too disparaging but why the 412? Shell no longer want to use 412’s for their work as they are “old” and not up to new safety standards, perhaps a more modern airframe would be more appropriate, or certainly it may be worth noting in your project that the 412 is old technology.
Miles