Your spending more than is needed here. Though I must say its one of the only builds I've seen that could actually max 4k games, but then you are sinking 2k into graphics cards

Basically you dont need the 64GB of ram most people will say 16 is overkill, 32 is insane and 64 is just unnecessarey unless you have a specific need for it. The 2TB SSHD is pretty pointless as well when you already have a 500GB SSD boot drive. You would notice no difference just going for a standard HDD as the second drive.
The biggest error you have made is around the CPU / board though. The cpu you have picked is a different socked to the board so simply wont fit. I've specced up the below basket based around your own with the main aim being to try and save cost to give you an idea of how I would do it. I've also made sure its a K series CPU so you can do some overclocking.
Picking a case is quite difficult for this buld. With the CPU cooler I've picked you need to make sure it has 2*140mm mounts in the top for the cpu cooler, another 2*120mm mounts in the front for the two radiators for the 295x2s, and then enough space to mount your drives without drive cages interfering with any of those radiators or that massive power supply. Without spending massive money the only case I can think of that can really do this is the 760t (some of the bigger XL cases can do this easily but there well over £100 more). I'd personally go for this case, ditch both of its lower hard drive cages as you can mount the SSD behind the tray instead then just get an adapter to mount the single 3.5" drive in one of the 5.25" slots. That way you get two nice clean open 120mm intakes on the front for the two GPU radiators which you could run as an intake. You can then use the two 140mm mounts on the roof for the CPU cooler probably again as intakes, and use the rear 140mm as an exhaust.
YOUR BASKET
2 x
PowerColor AMD Radeon R9 295 X2 8192MB GDDR5 PCI-Express Graphics Card £1079.99 (£2,159.98)
1 x
Corsair AX1500i Digital ATX 80 Plus Titanium Modular Power Supply (CP-9020057-UK) £329.99
1 x
Intel Core i7-4790K 4.00GHz (Devil's Canyon) Socket LGA1150 Processor - Retail £269.99
1 x
Gigabyte Z97X-Gaming G1 Intel Z97 (Socket 1150) DDR3 ATX Motherboard £259.99
1 x
Samsung 500GB SSD 840 EVO SATA 6Gb/s Basic - (MZ-7TE500BW) £209.99
1 x
Corsair Graphite 760T Windowed Full Tower Gaming Case - Black (CC-9011044-WW) £144.95
1 x
Kingston HyperX 16GB (2x8GB) PC3-19200C11 2400MHz Dual Channel Kit - Black/Red (HX24C11BRK2/16-OC) £129.95
1 x
Corsair Hydro H110 280mm High Performance Liquid CPU Cooler (CW-9060014-WW) £91.99
1 x
Seagate Barracuda 2TB 7200RPM SATA 6Gb/s 64MB Cache - OEM (ST2000DM001) HDD £59.99
Total : £3,683.45 (includes shipping : £22.20).
When it comes to 4k monitors they all use the same panel at the minute so just pick your favourite. They are all about £500 so even when you add a monitor to this build your still cheaper than your origional basket and it should do the job just as well and actually work