Here are 2 photos of the cabin and the barn from the Veluzat Movie Ranch. Unfortunatly the cabin was burned to the ground and no longer exists. I think BongTokingChuckles from the olf Friday The 13th board took these.
As you can see, the cabin still looked pretty similar other than a white bannister and white trim. This cabin was specifically built on the ranch for Friday The 13th Part III and it's a shame it burned down.
Here is the barn, this still exists and even though it's over 25 years older, it still looks the same.
Here are 2 videos of the locations at the Veluzat Movie Ranch shot recently. It's pretty depressing to see the charred ruins of what was the cabin.