Youre better of with a 60mm rad up top instead of going push pull. Less fans = less noise and a thicker rad with only push gives you more cooling than a thinner rad with push pull. Unless ofcourse the push pull is for aesthetics
Oh and if you go push pull at the top be sure to get some extensions for the 90 degrees fittings. Otherwise they will hit the fans and youll have a problem with the hose.
And those "special" thermal paste cleaners are not necessary. Just some cheap benzene (you know the stuff with which you can take stickers off) will do just fine. Atleast everytime ive used it it works perfect, its much cheaper. I guess they have that at Halfords so no extra trip to the shop
And youre gonna have a big problem with having 2 reservoirs. The only way it will work is to put the output of the FrozenQ above the input of the bay res. Otherwise you wont have any flow and the FrozenQ will flood. And I dont think theres enough space for the FrozenQ because it will interfere with the rad and fans on the top.
Another tip is to buy the fittings afterwards. So you can test fit all the components and use the hose to check for kinks, looks and what not and then order the fittings you need. This isnt necessary but for me it made things a lot easier.
Oh and you cant fit 120 fans on a 280 rad. So get 2 less Xigmatek Crystal Fan 120mm White LED and get 2 extra 140 fans if you want push pull at the bottom. Or vice versa depending on what rad you want to fit in the front.
Otherwise its looking fine!