"This was one of those projects where he was struck with inspiration and locked himself in his workshop for nearly two Years and explained himself at all only once he was done, and not in detail. - he used to read Tyelperinquar his notes at night but Tyelperinquar was three. And the notes were destroyed when Melkor attacked."

"But Tyelperinquar has been physically in a room with the notes."

"Uh, yes, when he was Joanna-sized."

"Doesn't matter. Finis do you own a Pensieve already or do we need to learn to make one -"

"No, we own one - we can see the notes," he says to Curufinwë - "we just need him to share the memories so other people can review them -"

"A Pensieve lets you walk around in a memory, inspect stuff even if you don't recall it all clearly," Miranda explains.

" - that'd do it, yes. We still won't be done in three years, I'm sure there're more to it, but that'll shave ten off -"

"Okay, what slows down the other steps?"

"Magical engineering is just slow. If I knew exactly what to write to the Silmarils it'd be two years just to do that - maybe one if Macalaurë gets his sleep-skipping and perception-speeding songs refined any -"

"Can you be more specific than 'just slow' -"

"You come up with the instructions to do whatever it is you want, and you split them into discrete chunks which have certain properties such that one being wrong does not undermine the others, and then you osanwë at the Silmarils the thought which will have the echo that imprints that character and if you get one wrong you have to do that chunk over."

"...why do you have to do it over."

"- because it's wrong?"

"And you can't edit it?"

"Nope. You have to start over. I have a pretty good error rate but that means about one character in a thousand comes out wrong, and you have to do a block an average of twice."

"So a charm to let you edit directly would cut dev time in half."

" - more that that, you could skip the chunking in the first place. Can you do that?"

"It's easy with writing - I'd need to know more about how this is different -"

He can do a very detailed description while Finis and Minor review the memories of Fëanáro's Silmaril notes.

Miranda takes notes, asks questions, tries a naive application of a few things on a less valuable magical object and investigates how they fail, and gets to work.

And so do the rest of them.