Setting the sniper up for 120 is as simple as a shock and fork.
I haven't had any of those issues. My bike is a large and fits two bottles easily in the front triangle. The 936 has one bottle mount. Sure, you need a wrench to replace the hangar. You need one for the 936 as well, but a small allen wrench rather than a larger open end wrench.
Sounds like you're simply wanting a change, so go for it. Mine is a T, so it has the extra brace on the rear triangle. Other than that the frames are identical from XC to T.
As for setup, I used the same components on both bike builds. Fork, wheels, drivetrain, cockpit, dropper, saddle.
Only thing different was the shock. Well, headset and bottom bracket too. I built the 936 with a fox DPS factory that I sent to Fox and had changed to 42.5 travel. I used a fox DPS performance elite on the sniper so I didn't have to see that annoying gold color. Functionally the exact same shock without the gold.
I built mine a couple years back, when the frame with shipping to my door was under $800.
At that price I might do it again. But really waiting for something else, and for prices to be back where they belong.
The sniper climbs and descends better. Noticeably. If you don't like whatever flex you are feeling with the sniper, I doubt you'll like the 936.

But get the frame. It's what you want to do, so go for it.

Well good luck having it done the wrong way.
And yes, sram absolutely DO recommend you do it the right way. If you don't want to believe their docs, send them an email.
Yes, every manufacturer on the planet routing it correctly does make it the right way. Some random bike building novice doing it wrong doesn't make his way the right way.
But whatever, you do you and have your brake hose routed the wrong way.

Why? Are you hoping that between the two frames you will have enough functional pieces to have one good frame?
Because that's not really a given.

Send it back. If you want this poorly designed frame, place a new order for the size you actually need and also get the better version.

I'm having a hard time understanding what your issue is. Here is your first post:

  At winter found some cracks around link in front triangle.  Carbonda claimed this as a warranty an said they send me new triangle in march. In march they said it delays to april. Now finally new triangle is ready, and they put me new recuirement - to cut off old triangle. At this moment I,m resting with shoulder injury. And I dont understand how I can dissasemble full suspension bike with inner cables with only one working hand.  And I dont want to stay without rideable bike for recovery period, with easy rides.  ( maybe shipping stucks for months). Carbonda do not accept my arguments.  Earlier I was thinking about building trail bike on fm1002, may be now it's not a good idea...

You want to get a warranty replacement for your frame because it has cracks that made you feel uneasy enough about it that you contacted Carbonda. Carbonda responded that yes, appears to be an issue and should be replaced.
Then your complaint is that you are resting your shoulder and only have one good hand and can't disassemble the bike. Yet you will have to either way in order to swap the frame's front triangle.

Now they decide me to pay 500$ deposit, claiming to return it when new triangle arrives, and I cut off old cracked triangle. Wtf??? )

Carbonda offers a very standard compromise - give a deposit and they will send a replacement. When you get it swapped over, you will get your deposit back.

I don't expect anything from them. I just want ride my bike soon, if I cut off it now, it will be unrideable for unknown time.

Can you ride your bike right now, as is? I thought you were injured and the bike cracked enough that it is deemed a warranty replacement item, likely unsafe?

So you want to continue riding a cracked carbon framed bike, while injured, and then when the new front triangle arrives, disassemble and swap the parts over?
If so, pay the deposit. Not an uncommon practice or unreasonable thing for a company to request.

But why do you want to ride a broken bike that you were concerned enough that you asked the company for a replacement?

I'd be more concerned with the fact the shock will be sitting in whatever crap you ride through - mud, dirt, sand, water and never get cleaned. The way it mounts alone would be a nope for me, let alone the horst link and massive upper linkage. Just a big nope.

In the way?