Hi new here and to the world of Eurorack, and I know my life will never be the same. I don't plan on going down the rabbit hole completely (famous last words haha), as it is more an addition to my current set up and I am a guitarist producing ambient music. I just want to have something to generate textures, sequences and happy accidents. What I have in mind is very basic. I already have a Moog Mother-32 and Subharmonicon. My dad is making me a nice timber three tier rack and I want to fill the third (top) tier with some modules and connect them all together no wider than 60hp (thanks for the idea Loopop).

So I am guessing some euro channel, a power supply and a mixer are the essentials, but thinking a couple of MI clones like plaids, marbles, rings ya know - the standards which are probably pretty cliche for hard core users but I really like the sounds. I have a board of full pedals so no needs for effects, plus I have some synths, drumlogue etc. Would be great to get the opinons of some much wiser in this space any advice is really appreciated, this looks like a great community.

• image below is what I have in mind so far
• is the power supply a good choice? Current should be more than enough.
• this may be a dumb question but does the ribbon cable carry audio?
• The sequencer module is probably overkill given both Moogs have one but I'm not sure what else would compliment this little rig any suggestions?

6hp left?
Doepfer A-185-2v Precision Adder.
You can then have one sequencer transpose the other, in tune, up or down,
and then share those new notes to that nice top row.

The power supply is fine.
The modular ribbon cable never carries audio. Just power and ground,
and sometimes, one gate for event on/off, and one cv, usually for notes.

Those two Moog sequencers are very different animals and can play nice together,
but the Subharmonicon is a demanding instrument to tame and integrate into a mix.
It's harmonic based, and always brings it's own special notes.
Spectravox is even weirder. For me, both of them are more for seasoning than a main course.

If you like that three-tier Moog format, consider maybe two Mother32s might take you further.
That'd be fun.

EDITED Today, 11:46

Thanks for the feedback I will look into the A-185. I have had the two Moogs for a while and pretty familiar with the subharmonicon. I really like it and have used it as the basis for a couple tracks, using one sequence for a bass line and seq 2 to form a pluck sequence over the top. From watching some videos it seems the Spectravox and Labyrinth are even more experimental so not for me. I thought about a second M-32 but decided to go for more variety.
Yeh the reason I ask about the ribbon cable is to consider how I am going to connect them all together, as the Moogs are in cases. I will take them out and mount into the rack so I can take advantage of the power supplied by ribbon cable. Looks like it's going to be cable spaghetti for the audio tho.

I built a three tier Moog like this. The red frame is from a guy on Etsy that 3D prints them and it wasn't expensive.
https://www.etsy.com/shop/Releas3DPrints?ref=shop-header-name&listing_id=1458591935&from_page=listing
Very sturdy and nicer than I had hoped. He prints them in colors other than red.
Really good work. Currently just $75. Can't beat that.

I kept the wood end cheeks but you don't have to. I thought they would end up lost in a drawer so I kept them on.
(To do that, I had to get 24 longer screws than what came with the frame.)

For the top row, I used the very nice empty Moog case that they used to sell.
They don't make them anymore, so you'll have to hunt around, but they're out there. A perfect match.
Unlike the other two, that empty case doesn't have it's own power so I used a Behringer PS,
running it all with one (big-enough) wall wart with a 3-way splitter wire to power the whole thing.

I did end up swapping rows 1 and 3 to keep the wires out of the way of those nice Subharmonicon knobs.
Worked way better on top. Here's how it ended up, as "The Squealer" (that really needs some mults).

For me, patch cable spaghetti never gets that bad.
I get lost on discovery road and forget what I'm doing, way before I run out of jacks and the wires to connect them :)

EDITED Today, 17:59