Power is overkill
1000W is definitely not overkill for this kind of build, and that doesn't take into account why overbuilt PSUs can be good idea in general with many benefits ( Being on top of efficiency curve, cooler & more silent operation, with hybrid PSUs like Seasonic you can run passive mode most of the time in fact, longevity.. )
Both 2990WX & 2080ti can have peak power draw of 280W each, and they will during IR with Optix for example. That's 560W alone at stock settings for both.
PBO (overclock) the 2990WX and the CPU alone can eat up to 350W draw on Air (Noctua UH-14) or up to 500W on water loop (to reach 4.1 GHz all-core), tested on both of my 2990WX builds.
Overclocked 8 modules 32GB of dual-rank 1.35+ V memory can eat up to 80-100W. Threadripper uses memory for the infinity fabric connection, so the memory gets higher utilization (when I compared my i9 7980XE to 2990WX, the difference for same memory kit was quite staggering).
When you adjust for proper frequencies and realistic V-Core, and input correct usage (rendering and total time of 16+ Hours per day), the suggested wattage from outervision calculator is 900+ W.
For top HEDT CPU+GPU, going straight for 1K Watt PSU is more than reasonable choice.
(cant really wait for gen 3 Threadrippers)
Are they completely out-of-stock where you are? Most places I see have few on order within a week (although most by mid-December). They are superior to such a level you shouldn't even consider 2990WX. Just shouldn't.
Esp. since you mention you don't even use more than 64GB of memory, which I find hard to believe as you only need to open few photoshops on top of Max and it's game over for me, but have you considered 3950X ? It has 80-85perc. of the multithreaded performance, but is massively faster in single-core, with none of the compromises from architecture that 2990WX has (only two dies have memory controller).
If you would be interested how such build could look, I posted my specs here:
https://forum.corona-renderer.com/index.php?topic=21416.msg159902#msg159902 I will build it in following few days.
On components:
Kraken X62 Liquid CPU Cooler- This will not work, 99perc. of AIOs use round Asetec pump/plate module that doesn't cover the heatspreader of TR platform. Since there is currently no AIO suitable for Threadripper (the only one being Enermax Liqtech II, and that's faulty product of super poor quality best to avoid), the only choice is Noctua UH-14s TR4, or custom water loop. The Noctua is perfect choice.
Intel 660p- This is QLC based SSD with all the negatives that come with it, although that doesn't make it bad product at all. QLC is super suitable for storage but makes for somewhat low-end system drive. I would advise going for something with faster cache like Samsung 970 Evo, the price difference isn't drastic for 1TB units.
Corsair 750D- This is 6 years old (or more?) old design, and it was mediocre case already back than. It eventually had "AirFlow edition" revival but it's costly, not worth the performance. Unless you already have this case, or you totally love the design, I would advise going with something far superior, like Fractal Design Define R6.
Last thing: Memory right now is
very cheap. It costed 2X as much last year, and the situation might not last, particularly for DDR4 which is at end of its life. You might regret in future for not buying 128GB kit when it was very affordable.