New Builder: DYMotorshop 750mm Mono - High Deep V "Jack"... watch me learn!

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Hello everyone.

I decided it was time to pull the trigger on a hull-up build; I wanted to build a real carbon self built monster.

I researched quite a bit: I wanted something that could crash through light waves here on local lakes in Saint Louis, and still capitalize when it's flat.
So, I figured enough playing with plastic hulls and buy into a real world "all 'rounder". I selected this hull and plan on running it with 6S power that I already have great batteries for and chargers for.

Meet "Jack". as in; "Jack of All Trades".

This is a DYMotorshop 750mm "High Deep V" Carbon Kevlar Hull. I'll be taking setup guidance from builds like the (OSE Carried) Delta Force 29.

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Goals:
60-70mph in SAW/6S mode
40-50mph in "4S Basher" mode (aka "choppy water mode")/5min runtime per 4S (graphene) Pack

Parts already decided:
6S LiPo Power (existing EC5 Fitted 3S 50C 5200mah packs)
4S Graphene Power (existing EC5 Fitted 100C 5000mah packs)
36mm "power" motor (ordered a SSS 3682 1650kv this morning)
OSE 36mm fully adjustable carbon motor mount (ordered this morning)
OSE 150A Raider ESC (ordered this morning)
Spectrum STX3 Radio/Reciever (already have)
Carbon Battery and ESC Trays (ordered this morning)

What I need help with:
How do I decide on a flex shaft? how do i measure this? what parts do i need?
How do I decide on a stinger setup? or should I do a strut?
Should i consider a flood tube?
How do i determine motor placement?

I've never built a RC Driveline on my own, how do i decipher shaft size and prop shaft size and teflon tube size vs stuffing tube size and more!?

How do i pick prop sizes? I figure i'll have a basher type prop and a top speed prop, how do I pick these? (I have some CNC props in 40mm, 42mm and 43mm to start)

Thanks in advance!

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Alex Narconis
(background in electronics/computers and fiberglass, mostly new to the drivetrain part)