Manure plans are....?
Do you
need 80-100 chickens for eggs?
That's A
LOT of eggs!!
That was tongue in cheek.
As you are just starting out, or rather planning well ahead of time(KUDOS!),
https://www.backyardchickens.com/threads/new-to-the-idea-of-chickens.1183627/,
readreadreadreadread here about different situations, things that went well, things that did not, different coop configurations, different feed/water setups.
There's
ton of little things that can make a big difference,
and some big things that you don't want to skimp on,
learning it all is like getting a sip of water out of a fire hose.
I read for 6 months before starting to build, and I had a big shed to start with.
There's ton of good info here but you have to wade thru a lot of flotsam and jetsam.
I kept notes(copy and pasted links and text) into a word doc and a spread sheet as I found stuff that I wanted to save for reference later.
Not sure how you chose 16x24, and whether that is carved in stone or not,
but it would be a very nice sized building that would give you many options.
Design your space to be flexible and multi functional.
Nipple in pipes with heat and flow not impossible but complicated,
I wanted it but settled on this and it has worked out very well.
https://www.backyardchickens.com/articles/aarts-heated-waterer-with-horizontal-nipples.67256/