I'm open to suggestion on all these parts if you think there are more appropriate options.
The venerable Scythe Heatlane was not mean to cool an high frequency (>68W TDP) ten years old CPU under any condition, without a direct airflow; Scythe itself said: "This product is not recommended to use with a high CPU frequency. Your CPU load should be limited to low-mid loading. Please use this product at your own risk."
Said that, your current setup is pretty unusual, so it's difficult to advice without any experience of your overall balance.
Given that you will have two 120mm fans running inside the case, at first glance I don't think a fanless PSU is the best option cooling-wise, but on the other hand your system let the Phantom 350 to survive, and it's a great achievement, because that PSU is really crap, reliability-wise (I've had the slightly revised 500).
Thermally the proposed system seems to have a tad higher limits, because the GTX750Ti has an about 20W higher power draw, but your past history said it *might* be still feasible.
I don't understand whether your current VGA is fanless, or not: in that latter case, you have to take into account a likely, further, higher heat build-up, with the passive Accelero S1.
So, lots of doubts, even better, lots of questions which only test can answer (as I can't know whether you actually have some spare room to grow the overall thermals, or not).
Well, about your proposed system: just my minor observations.
I don't like the Gigabyte mummyboard, historically GB BIOS is not silencers-friendly and besides the B85 chipset lacks the good Intel fake RAID controller. In my humble opionion an ASRock H87 would be more suitable, and an ASUS Z97 also is.
Then I wouldn't pick the SandForce based Sandisk SSD, the UltraPlus is a decent drive but a Crucial M500 should be cheaper and offer better performance with compressed data, and also a basic power-loss protection.
Given a boot SSD, I don't understand at all the choice of a multiplatter 7200rpm drive: coupling it with a passive CPU heatsink, a passive GPU heatsink and a passive PSU has a litttle or no sense, in my humble opinion, airborne noise and seek one are not drowned out (and cannot be completely muffled) by anything.
Set aside the question about why not a fanned PSU, eventually I don't understand the choice of the massive 520 Platinum unit: the 400W one is far more than enough (even the SuperFlower 430 could be a viable option), and it should be noticeably cheaper.
Last but not least, I would stick with Nexus fans: there are no really better candidates, but if you want to go with PWM fans, I would look at the last batch of Scythe Slipstream in the market.
Well, that's all folks: good luck for your re-build!