""" -What is a post cross? And what is its function? """

When you auger an 18" round post hole for the post you'll want some steel through it to go out into the matrix of the redimix. The post hole is 36" lower than the wall panel. At the 9,18, & 27 you drill a 1/2" hole through the post, spraypaint a piece of #4 rebar and pound it through the hole until 4 1/2" is sticking out of the opposite side. Now place the post into the hole with the rebar parrallel to the beam, and fill with concrete redimix. These crosses at the 1/4, 1/2, and 3/4 marks of the rise will distribute forces to the concrete matrix along with the post itself.

""" -Confused as to what you mean by beams and what they do in this application. """

This CCA lumber is no longer available for consumers in dimensional grade lumber (2x4 2x6 2x8 etc)The Fed's outlawed it due to the arsenic in the treatment. Now it's only available in support lumber such as beams and posts. It's mostly only used by carpenters who build boat docks and bulkheads and home builders who choose not to have a concrete slab but instead place the load bearing floor beams on concrete blocks or poured concrete footer beams.
You utilize these instead of your 2x6 and drill a long flush head lag screw through the 3x12 and into the 6x6.
The purpose is to have a smooth front to the board, you could also get a paddle bit open a slight hole and put a regular bolt head dipped lag screw with a socket. The head of the screw will then be behind the leading edge of the board where it wont show on the liner like a pimple.

""" -What is a zipper """

The zipper is where 2 boards meet on a common post. You don't want all of them to start and end on the same post because it could allow deflection as the fiber in the lumber begins to degrade over time. Start the first one from the top down to begin at the corner and go to the 3rd post, start the 2nd one down on the corner and go to the 1st post, cut it and then start the 2nd one, on the 3rd go to the 2nd post and do the same. Now your allowing 2 of the boards to offer maximum strength to the one that has its end on a post meeting the end of the next board running down the side of the pool.

""" What is a kicker and its function? """

A kicker is a strong board fastened near the top of the post angled back and down at a 45 degree angle and fastened to the small post base for fastening. This is insurance against outward movement of the pool beam. A post is placed in 18" of concrete with 6" to 9" sticking up and out to fasten the kicker to.

""" What is this substance? """

It's a cementious bagged product to stabilize the floor, like pouring concrete on the floor would do. The liner needs something solid beneath and on the sides of it to rest upon and push the water pressure off to.

""" Sounds like someone could make a small fortune bringing this trade back into service or writing a book about the process,Hmmmmmmm..... """

No matter how affordable it would be I feel I'd be hard pressed to sway one of my pool buyers away from concrete and plaster and over to a wall panel style vinyl liner pool. In our market all vinyl liner pools are looked down on by the bulk of the purchasers as not being a permanent pool platform like concrete. It doesn't matter if they're steel walls, composite walls, or wood walls.
Now a book might be worth pursuing.

The funny thing is that I've kind of kicked around the idea of this type of pool up at my country property where I'm going to retire to. I have to build a buckaboard home, pavilion, and pool that'll all be paid for once finished. This is an Eastex Bubba home, get a buck, buy a board, and nail it in place. Once finished the home is paid for on the 1st day of occupancy.
I could probably build a 24x54 rectangle liner pool for the same price as a 32x16 gunited concrete pool. The pools we used to construct were always 18x (30,36) or 24x (36,42)
Although I love my current pool there's NO WAY I'm going to drop this kind of coin again, It was for my kids and bragging rights, LOL!!!

Note to all readers,
I've posted this many times before and will enlighten you and other readers again, Trust me on the following, this is FACT.
Every pool is a good pool regardless of type, inground vs-above ground, and type of platform concrete-vs-vinyl liner-vs-fiberglass. And big pool-vs-small pool is just the same.
We pool owners all share an equal responsibility in maintaining proper water chemistry for the type of pool platform and for the sanitary water for our swimmers.
And once you dive in and hold your breath your 100 percent wet, you won't get any wetter or have any more fun in an Olympic size swimming pool, all you get is more elbow room.
Although additional elbow room is priceless, it comes with a higher price tag everytime.

I don't say this because I'm a pool guy. I'm actually a pool kind of guy. Everything at home with me, Mom, and the kids has revolved around the swimming pools we've enjoyed. Even though we've had some AWESOME pools they still came at a cost, it wasn't retai like most buyers pay but it still cost a ton of money to get what I've currently got.

See ya,
Kelly