If memory serves......Thorin really wasn't wearing armor during the Battle of the 5 Armies.....he might have been wearing chain mail under his surcoat but as far as the heavy plates that any of the Ironfoot Dwarves were wearing or even Lord Dain II, I think all he really had was that octagonal shield.
Because he was a fast and swift warrior. The armor made him slower, hindered him and his fighting style.
Also, it was also to show his greed for gold, he was the king and wanted to be all fancy, when he finally seen through, the first thing he did was tossing that crown aside with everything else.
At least the shins don't seem hard to be, the front seems to be made of 4 pieces connected at 45 degree angles. And similarly so for the kneepads, and gauntlets. And maybe modify a Skyrim pep file for the torso?
Those are less than 45 degree angles......Print out a pic and use a protractor and you will get a closer angle. I'm pretty sure that some aspects of Skyrim armor could be used.