Couple of points worth mentioning - I have put angled bends in as I really prefer that look - all straight and orderly 
I have compromised on having some 45 degree angles in there as I read to not have too many 90s. So I understand (which makes sense) 45s would be better.
Is it worth me putting in this optional 120mm radiator at the same time I put this in? I am planning on using a 420mm radiator (Watercool HTF4) at the moment. This will sit on top of the case. I'll also be trying to tidy the cables up a bit but not sure how easily I can do that with this case and PSU.

I have compromised on having some 45 degree angles in there as I read to not have too many 90s. So I understand (which makes sense) 45s would be better.
Is it worth me putting in this optional 120mm radiator at the same time I put this in? I am planning on using a 420mm radiator (Watercool HTF4) at the moment. This will sit on top of the case. I'll also be trying to tidy the cables up a bit but not sure how easily I can do that with this case and PSU.
).