A full harness of plate? No...
I have made numerous maille hauberks and coifs. A scaled leather hauberk that I used to fight in, with composite leather and steel vambrace/rerebrace with steel elbows. Steel cuisses with copfs and demi greaves.
The hardest part of the metal work is the acutall cutting out of the pattern. I need to get a plasma cutter, or at the very least, some Beverly Shears. My stepfather has a plasma cutter and I should just go for a visit some year and spend a week cutting patterns...