Bzr12WABeerd :
The 88r's PSU-length limitation is at 160mm while the EVGA B2 is 180mm in length. To give the B2 PSU and its cables the space it needs, can I remove the 3.5 drive bay to do so??
Yes you can (and depending on how you manage your cables, you might even get by with retaining the drive cage).
To give you an idea on how much space the PSU will occupy, this photo on the Corsair 88R website (http://www.corsair.com/en-gb/carbide-series-88r-microatx-mid-tower-case) uses the Corsair AX860i PSU which is
160mm long (notice how big the gap of the cables between the PSU and the drive cage, despite the "160mm limitation"):
This build (https://pcpartpicker.com/b/c87hP6), using the 88R, has a 170mm-long PSU (FSP Hydro G 750W), with the drive bays still in tact:
This build (https://pcpartpicker.com/b/Wnf8TW), with the same case, used a Corsair RM850 PSU which is
180mm in length. Drive cage was removed:
This build (https://pcpartpicker.com/b/6fsJ7P), used a Corsair RM750 PSU, also
180mm long, but the drive cage is retained in front of it:
The main advantage of your EVGA B2 is that it is semi-modular (i.e., the large/thicker cables like the 24-pin) are already attached to the PSU frame (unlike in the photos above using full-modular cables). The B2's thick cables are located nearest/adjacent to the cable routing hole just behind the drive cage of your Corsair 88R case:
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