There is a fair amount of Fine print/hidden cost when going modular that no one talks about that ended up delaying this process. Allow me to explain and hopefully save someone else the same hassle!
Most, if not all Eurorack modules use 10 pin connectors for power. Most, if not all, power supply bus boards use 16 pin connectors. This seems ludicrous to me in that you have to have 10 to 16 pin ribbon cables to hand to use anything. Plus, they run about $5 each, plus shipping, so make sure you have enough spare 10-16 cables in house before assembling!
Mounting screws, it seems, are optional. They also appear to be different sizes depending on what your skiff is. Some use 2.5M screws, others 3M. I ordered 2.5M screws. I was wrong.
After obtaining screws and proper cables I was able to finally get the rack assembled yesterday after about a 7 day delay as the place I orderd the ribbon cables from sent 16-16 instead of 10-16!
Installing Eurorack modules is its own kind of terror as well because if you get the cable wrong you will FRY THE VERY EXPENSIVE MODULE! I installed the Happy Ending into a 4U rack with my JV-880 in the bottom 1U, perfect for rehearsals and gigs, as its surprisingly lightweight albeit a bit bulky.
I will tell you that when you get everything connected and fire it up and see the Mother-32's lights a-twinkling, it was a very heady moment. I mean, the skiff just LOOKS super badass nerdy!
I actually had slightly better results using the Boomstar with the MiniBrute than with the Mother-32 with the KeyStep. My guess as to the reason for this is the input for Ext Audio on the MiniBrute is much hotter than the M32.
However, using dual square waves with the M32 and Boomstar ... the only way I can describe the sound is sumptuous, especially when I set the Boomstar one octave below the M32 and brought in the sub an octave below THAT. Press a key on the KeyStep, press the Hold button, and you have the thickest bass pedal sound imaginable. Seriosuly, it should be tested through a PA before bringing to a gig, it will rattle lights with ease.
So my takeway from this experience?
Make sure you have all possible excessories to hand before assembly.
Also, that I NEED another filter and VCA.
Fortunatley I already have the Mother/32's skiff.
And thus began the great Descent Into Madness!!