The only reason to go for a Mac for music production is because you insist on using the Logic Pro program. Otherwise it's even and only a Windows or MACos fanboy will tell you it's different.
$2000 to 2500? That depends on which country were talking about. In the US the build you listed is substantially less than $2000.
A microATX (aka mATX) motherboard will work anywhere an ATX motherboard would work. The width dimensions and the location of the I/O ports are the same. The only difference between mATX and ATX is height. mATX is usually 9.6" tall and ATX is usually 12" tall. The specs for the be Quiet 600 list compatibility for miniITX, mATX, and ATX sized motherboards.
The Intel 600p isn't a bad drive and it's very reliable. However, the Samsung 960 evo is much faster, and it's very reliable as well. If the evo is the same price or a little bit more then it's a far better pick. The 600p pulls in Sequential read speeds of around 1300-1600MB/s, but the 960 evo pulls in Sequential read speeds of 2600-3000MB/s. Also, the Access times of the 960 evo are far better than the 600p.
If you're recording audio then I assume that you're bringing your own DAC.
The GT 1030 is an awful pick for gaming and you will be disappointed with it, unless the games you play are older games from 2011. The performance for the dollar it offers won't come close to matching a GTX 1050. The GT 1030 is capable of 720p gaming, but there are some, but not all, newer games it can run at 1080p low settings.
AT least the GTX 1050 will run games at 1080p at medium to low settings, and there are some games it can run at 1080p high settings. The GTX 1050ti ups the ante and it will give you somewhat better visuals, because it's 20% to 30% faster. If you want to play games at high to ultra settings then you would have to spend more on a 6gb GTX 1060, but at least the 6gb GTX 1060 is twice as fast as the GTX 1050ti. A 3gb GTX 1060 that's below $200usd is not a bad value, aside from being starved for VRAM. The 3gb GTX 1060 uses a cut down GPU that's 11% slower than the 6gb version.
At the minimum, look at the GTX 1050 but if you can afford a GTX 1060 then get that.
The Ryzen 5 1600 is a good all around option and it's probably one of the most well rounded processors out there. With DAW it's a good measure to Invest as much into the CPU as possible and the Ryzen 7 1700 would actually be a better pick for you.
You can make cuts with the power supply. A good 80plus bronze 550w unit is more than capable of running your setup. The grey label Corsair CX550 is fine for your setup. With that Seasonic, the Titanium rating and fanless design is overkill for the amount of wattage it provides. It would be like buying a 20" 4k monitor. The screen is so small that you wouldn't really see the benefits of 4k. The point is a 20" to 24" 4k monitor is a bad value and so is the Seasonic Prime 600w. That Seasonic Prime is for people who want a dead Silent PC and they're willing to pay for Silence. You would be better off looking at something with a fan that spins at a low RPM.
If you insist on quality then look at the EVGA 650w P2. Even the EVGA G2 series provides more than enough quality. You would be much, much better off saving money with the EVGA 650w G2 and then going with a Ryzen 7 CPU.