I don’t at all have your CaD or printing talents so you will have to forgive the quality of the next image but helps describe what I mean.
In my S-pipe version I wish to adapt what the Google engineers did with a cone facing a single speaker, its a slight curved cone also but on the right I just drew that awfull triangle to represent the side view of a cone 
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My drawing skills are so bad that the pointless effort of centering the left V shape means its too low, the bottom of the V should be the center of a circle.
You will have to forgive the drawing as said and forgot the solidworks term which is oppisite to extrude but if you started with that standard cone and shaped it into that V that is something like what I am expecting.
The badly worded oppiste extrude creates a chamfer so its a wider and more directional, also harder to explain but basically that and blended to create a final form.
The Myford puck I am playing with uses schedule 40 4" pipe with a 3.3" full range driver.
So the imaginery speaker cutout is 75mm in an inside diameter Sched 40 4" tube of 102.2604 mm.
The cutout is hidden which is good for the likes of me as we can be quite brutal with a jigsaw or dremmel.
The actual shape is far from formalised but its an impossible shape and profile to describe or at least it was for me.
It just makes more sense to describe how I am going to assemble.
On top of the tube I have a 6mm thick circular acylic disk as I can get those cut pretty cheap.
Its 114.3mm diameter and sits on 4 hex spacers that go to another acrylic disk that is the internal diameter of 102.2604 mm.
The spacers raise the top disk so there is 10mm gap from tube to the lid forming top disc that does a similar thing as the google design but rather than omnidirectional it creates an unidirectional sound pattern.
Its actually a really complex shape that 3D tools would have no problem making.
As well as creating the dispersion pattern of sound it acts as an acoutic cover to the microphone array.
Also the V shape is to house the possibility of a tilt mechanism and provide a path for a Pi Cam style ribbon cable to pass down to the lower non acoustic compartment of housed electronics.
@guhl if you ever have any spare time then please give it some thought as you seem to be really talented that way.
I am a terrible hack with code and also the same when it comes design assembly but part from that one 3D printed part I can accomplish much with just a drill and some simple tools.
The top disk as said fits on of 4 spacers that on the underside hold mic array and this wierd and wonderful sound dispersion cover.
They go to another acrylic disk that I forgot about which is the speaker cut-out (75mm) but underneath the spacer pillars continue to the bottom acrylic disc that continue again to a FRB board that makes the base of the SBC/Amp/Buck housing.
Those 2 disk should really be sealed with resin, hot glue maybe silcone or something but they make quite an adequate acoustic cabinet once sealed.
If you are going to go all audiophile you might want to line with some rubber sheeting.
What I am proposing is super low tech that I am wondering how you can produce such a great and complex design and then have an opinion and belief people might get lost in modularity complexity.
The modularity is so simple that the choice and position of the drill holes allows you to mount and array of Mic boards, SBC and amps that can be printed out on a paper guide.
The only thing that is complex is the shape form of “dispersion cone” and is perfect for 3D printing as apart from bespoke molded parts there isn’t really a way to do it with conventual engineering or materials.
Like I say if you ever do have any spare time or anyone else in the community who is a solidworks or whatever and 3d printing guy then please do.
I have ordered a few bits of plastic just to build one up minus those essential bits of finnese.
I will post some pics when its assembled as you never know it might perk some interest.
So the S-pipe is on its way.
