Episode 5 was by far the best. I loved the initial introduction to Celebrimbor, but something was missing. I realized Celebrimbor didn't appear like he's ever wielded a hammer in his life. He didn't look like a renowned Elven smith. I needed to see him actually forge something to truly appreciate the character. Well, Episode 5 delivered!
The construction of the mithril tanning beds, radiating enough silmaril light to soak all elves in it, was a stroke of genius. I was wary of the "mad scientist" Celebrimbor, but you have to be a bit mad to be a true craftsman.