If you want a mini-itx system you can forget about X99 and Xeon CPUs. I wouldn't think of that all AL case by Streacom as something I'd want to use on the road. You can find some nice and light Aluminum cases by Lian Li that would be perfect for mobile use and look good too. Then you can use an I7-7700K, overclock it and use a small liquid cooler to keep it from overheating. You really can't come close to the speed of an overclocked I7-7700K with any of the current Broadwell EP Xeons (E5 V4) anyway. The more cores you have the slower the clock speed has to be.
Here's a mini-ITX case from Lian Li that could hold all the storage you'll ever need and stay cool as well.
https://www.newegg.com/Product/Product.aspx?Item=N82E16811112458&cm_re=Lian_Li_Mini-ITX-_-11-112-458-_-Product
https://www.newegg.com/Product/Prod...106337&cm_re=water_3.0-_-35-106-337-_-Product
a quiet Liquid Cooler by Thermaltake.
If you wanted to go completely silent, no cpu overclock or mechanical HDDs then you could use this one with a Noctua CPU cooler /fan combo and a silent Seasonic PSU (fanless). That's about as close to silent as you could get when using an I7-7700K.
https://www.newegg.com/Product/Product.aspx?Item=N82E16811112536
This is an ITX motherboard you could easily overclock with and use 32 GB of fast DDR4 ram.
https://www.newegg.com/Product/Product.aspx?Item=N82E16813128969&cm_re=Z270n-_-13-128-969-_-Product
If you won't be overclocking then get the Z270N-Wifi. It still gives you the option but is not as good at it as the gaming version.