Two great videos, the first one is nice to have a look from "the top" :-) At the end you put kilos of reverb, yeah! ;-)
The second video and track is indeed more classic approach, more something for me ;-) Nice touch with the guitar by the way! You have a nice sequence going on there.
Regarding cases, yeah, I not a mantis case fan either. If it must be a 6 U then check out the Doepfer - A-100LC6 that's 2 x 84 HP at about Euro 379.
Though if you add 60 bucks then at Euro 439 you'll get a 9 U A-100LC9, I do think this 9U is more worth it (however keep in mind that the mA per HP is less though; same one PSU 3 with 2000 mA at +12 V).
A-100 LC6, 2 x 84 = 168 HP total, price Euro 379, price per HP is Euro 2.26 and 11.9 mA/HP
A-100 LC9, 3 x 84 = 252 HP total, price Euro 439, price per HP is Euro 1.74 and 7.9 mA/HP
Or if you want the more fancy one then go for the A-100 P6 or A-100 P9, same space, same specs, it just looks better.
The nice thing is that you always can extend it with an A-100 LCB or an A-100 PB and then you got a nice set together. I have the A-100 LC9 on top of the A-100 LCB, nice little set together (they stand next to the big brother set A-100 LMB and LMS9). I am happy with both of those sets.
If you want a bigger one but insist to stay with 6 U then you might want to consider the Doepfer - A-100 PMS6 that's 2 x 168 HP and comes with two PSU3 power supply units.
Up to you ;-) Kind regards, Garfield.