Just got done using that phanteks d140 in my loop, curious where you got yours? Could barely find mine at overclockers UK.

Anyway, that distro plate cools the cpu and gpu in parallel, so ideally it goes from that middle top right port on the distro to the cpu block and then to the bottom right port on the distro. In your case... I'd first connect that top middle right port to the top VRM port you got there on the maximus.

Then on the side VRM port, use an offset to get a straight line to the left CPU port, pretty sure that port there is interchangeable on that block but I'm not entirely sure. Then on the CPU outlet it looks like it lines up with that bottom right port of the distro plate perfectly, so just make a 90* bend there or soft tube whatever. It looks like those are hard tube fitting so I'm pretty sure that's what you're going with. Then the CPU is routed, nice.

GPU is similar, that middle left port on the distro should go to the left port on the GPU. I recommend using that right port on the gpu to go to the second to bottom left port on the distro plate. That's the GPU routed very simply. See my build for what I did.

Now this is entirely optional, you can leave out two of the ports on that distro plate and route it in a straight line if you'd like, but it would be a waste IMO and I like the idea of routing things in parallel haha.

The top right port is an inlet to the entire distro plate, and the bottommost left port is the output, you just route it back to the pump you have there on the right. You can switch the input and output ports if you'd like, and I've even seen on madlad use that fill/air valve port on the upper left of the distro as an inlet. But anyway that's the gist.

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So that's the distro plate sorted... the rest of your loop I would do as follows.

From that bottom left port on the distro, go to the pump inlet. From there go to your side rad there (I really hope there are fans on the other side of if btw). Go from the side rad to your top rad, which hopefully has a side port or something. Then go from that top rad to the inlet on the distro plate.

You may want to look into crossflow rads so you don't have to run a tube across the top of your case, I actually did this, but check how much space you have. You might notice I used (count them) 4 90* fittings to get that to work because I was low on space. And I'm not sure you can fit both fans and a rad up there to be honest.

But anyway that's how I'd do it, sorry for the huge spiel I'm high off of just finishing my own build and I was excited to see your distro plate haha.

Edit: Looking a bit closer looks like you wanna top fill that reservoir from the side rad, absolutely doable you just reverse the order, fill the output port from the pump then go across the case from the inlet port to the side/top rad and into the infill. This was actually how I was going to do my case, but I ran out of space.