Re: Cable length
Thermaltake V71 at least on pictures not look as huge case.
Maybe is bigger in live.
People with huge cases didn't complain. If you have problem in V71 what someone with EVGA DG-87 or PC-V3000 to say.
I suppose you have problem with CPU cable.
Is it possible to install CPU Cable through upper side grommets.
I always keep one 8 pin extender in house because many brands in past forgot that PSU later were installed on floor,
not on top any more. Now last few years no such problems or they are very rear.
i7-5820K 4.5GHz/RVE10-EK Monoblock/Dominator Platinum 2666/ASUS GTX1080Ti Poseidon/SBZxR /Samsung 850 EVO 1TB /EVGA 1200P2/Lian Li PC-O11WXC/EK XRES D5 Revo 100 Glass/Coolstream PE360-Noctua NF-A12x25 PWM x3