B2L2

Wife was planning to do fake ceiling earlier and we talked with our contractor a bit.  We weren't planning to DIY but I understood what's roughly involves.

You will be using drywall as the fake ceiling materials.  In your case, you need some way to suspend the fake ceiling.  You could use say 4x2 to build up a frame and then attached it to the real ceiling and walls.  Next, run your wiring and others thru the frame.  Last, you bolt drywall to the frame and then do all the finishing.

If you use the right screws, you shouldn't worry about it falling down.  All the wires will be behind the drywall.  Question is how to run it from your power source and where to put your light switch.  This may require to drill your current wall to connect them.

I don't know what's the 3300K LED.  In my bedroom, I ran LED light strip for decoration purpose and they aren't bright like those in your picture.

B2L2

I'm using the 5m roll with 300 LED.  Maybe I could take a picture for you.  You could buy those 5m roll online for <$40 easily with multi-color and remote.  Lee's price is still too expensive unless you need something immediately.

I agree drywall finishing needs a lot of details.

We ended up not make a fake ceiling but a fake wall instead.  Roughly, it takes my contractor 1 day to setup the frame, 1 day on putting up drywall, and 2 days on finishing, then couple hours on painting.