Hi OuterSanctuary,
Welcome to modular synths :-) Let's start with the "easy" part. If I am not mistaken you are looking/planning here at an Intellijel casing, nothing against it, really. Just if you get yourself an Intellijel casing with a 1 U row then only Intellijel 1 U modules (or compatible brands to Intellijel 1 U) are going to fit in that 1 U row... this means the Pulp Logic isn't going to fit. So get rid of that Pulp Logic module ;-)
I have been attracted by the Atlantis module from Intellijel myself several times as well and I still once and a while look at it and think: "Hmm, interesting!"...
But then I sober up from my sexy module syndrome and hold a virtual mirror in front of my face and wonder...
Why should I have a modular synthesizer and then get myself a complete synthesizer module? What's the real point of that? Sure, it's easy and in one go, you got pretty much, kind of lazy way of deciding not to decide to go into the details of all modules and just go the easy path of getting yourself a complete synthesizer module... in a modular synth?
I gave that thought a few moments and then, at least for myself, I felt... oh that's odd... indeed why I want to go for a modular synthesizer and then buy a complete synthesizer module, that doesn't make sense, now does it?
That's the reason why I haven't bought any complete synthesizer module yet because... well then I could have bought instead of a modular synth, just a complete external nice interesting synthesizer, couldn't I?
Don't get me wrong here, I do believe the Atlantis is a fantastic module, I am still considering it, but the price keeps me away from it together with my above "philosophy".
To summarise this: To start with a modular synth and then as the first or second module to buy a full synthesizer module... mwaaahhh, that sounds odd and weird at the same time to me ;-)
I hope you do get my point here? :-)
Instead of starting with the Atlantis and Metropolis, if this was going to be my rack, I would get rid of these two modules for the moment and start with others. I wouldn't start with two Dixie 2+, just start with one, get some experience with it and then decide if you love it so much that you need a second one or if you would like to give another brand's VCO a chance instead? So wait with that Shapeshifter as well, most likely one of the best modules in the world but a heavy one to start with, so you might want to consider another second VCO to start with. Then when you got experiences with that Dixie 2+ and the 2nd other VCO, then check if you still want that Shapeshifter and a 2nd Dixie 2+.
Not sure if you should start with an ADE-32 module, looks quite "heavy" to me to start with, I would rather consider at least one or perhaps two more simple LFOs. EGs you have for the moment enough I think but you are lack on a few classic LFOs.
Beside the QPAS filter, you might want to consider a 2nd filter for some variation. I can confirm though that the QPAS is nice, I just got it recently myself and I am quite happy with it. As a second filter, just as an example, you might want to go with a Doepfer - A-124 Wasp filter, little beauty that is. Or if you want a slightly milder one consider the A-106 SEM filter instead, both are nice filters to use.
Assuming you will get rid of Atlantis, Metropolis and the Shapeshifter, you can pamper yourself with even a third VCO, let's say the Plaits from Mutable Instruments? Then you have a bit more of a variety to play with and the good thing is... you still have space left in your rack. Leave that free space, you need that for the near future once you got a bit experience with your rack, your ideas might change a bit on what you want to add, etcetera.
Regarding those 1 U modules, make sure you don't forget to add an audio output module, that can then connect to your Intellijel casing output connectors.
I think this should do for starters, should give you some "food for thought". Take it easy, don't plan the entire rack full and I wish you lots of fun with planning and later playing your rack :-) Kind regards, Garfield Modular.
Edit: Removed typo.
For review reports of Eurorack modules, please refer to https://garfieldmodular.net/ for PDF formatted downloads