Finally built the two this weekend !
No problem to report about the frame.
Brake mounts were aligned. Smooth inside. Headtube ends clean.
Same great build quality as usual from Carbonda.

The pink one is for my sister !
Unfortunately I did order a 31.6 seat tube. Waiting for the 30.9 to arrive.

With GX AXS, a ZTTO cassette as she wanted a rainbow, but didn't want to invest in an eagle cassette, we'll see how it goes.
In the picture it is a ZTTO chain, but I don't like the noise it makes, so I have an XX1 on order to replace it.
The wheels are the XC925 from lightbicycle.com with 240 EXP hubs, CX-Rays spokes.

The ZRACE Hardrock crankset looks well built.
The Onirii M4 brakes were a very nice surprise, they look awesome and were very easy to assemble, no bleed required.

The brake adapters coming with the frame F PM160->180 and R FM->PM are a bit chunky, but free 
I had to file a mm or so from the rear one to let the M4 totally on it.

The fork is temporary, she's not a rock garden type of rider, and I try to convince her a rigid fork will be enough.
If it works, we'll order a pink one, if not, we'll buy another fork.

For recalcitrant brakes, I usually put the pistons back and remove the pads.
Calipers have generally markers to center the caliper on the rotor that must be true.
Try to align the caliper with the disc(it must be as flat as possible) the best you can.
Put the pads back and brake to see what happens.

Now gnerally two problems can occur.
Either one of the piston sticks more than the other.
Or the mounts are not faced.

The first is easy. Get some silicone gel used in plumbing to assemble pipes.
Get one piston as out as you feel comfortable without popping it out.
Clean it with alcohol and apply the gel on it.
Put it back in and out a few time to lubricate everything.
Mineral oil can be used as well for the brakes that use it.

The second is easy too... if you have the facing tool.
Face the mount. Recenter the caliper, put the pad.

And ride !

I tried contacting Speeder through their live chat, but instead of answering my questions, they just closed the chat.

Try harder 

That looks pretty rough ... hopefully proto.

Yes, like a 3D print. And chunky.

Yeah I ran into the same issue. I don't get why you would ever use a lockring with external toothing. I find them harder to install, and they've never fitted in any of the frames I tried them with.

The end cap of the older DT-240 12mm were not leaving enough space for the lock ring tool.
Worse you could kind of tighten it, but good luck to get it out.
The EXP doesn't have this issue anymore.
There are flatter versions of this external lock ring, but require more care to tighten.

May I ask for a photo of the finished build?   and how is your impression of the bike? I am thinking of the 1306 although I would like a smaller steering angle around 67°, which I can't really find for hardtail frames with 100.

Sure. If everything goes according to plans, the first one will be built this weekend.

Shimano also patents changes with battery... Sram can patent "its" battery, "its" clamping and similar things, but I don't see why other brands can't use removable batteries... Shimano has its satellite buttons ( patented ones are supposed) did not Sram take out his Blips?

There are strange patents like a 24mm axle between two bearings belongs to Shimano.
So came BB30 & Co, GXP, DUB,... giving us all kind of compatibility troubles.

For the wireless, it isn't clear. Plenty of legend like mine on forums.
https://bikerumor.com/sram-electronic-drivetrain-patents-show-wireless-road-mountain-bike-designs/ has a good overview but nothing on batteries.

It is strange Shimano and others are coming with semi-wireless, while they could do the same as SRAM.
Easier to setup and maintain, cheap batteries, that you can swap between components in case your derailleur is flat.
I don't see an advantage, except a longer battery life maybe, of a wired battery in the frame.

These are 21oz Camelbak Podiums, I'll have to try some longer bottles

Clever ! I'll check if this could work on a size M