They have there own tech crews so yes!
Probably
The folks at Micro Center are top notch, I'm sure they could assist. If you go to the Newegg YouTube channel, they have walk throughs on EVERYTHING. NewEgg for reviews and videos; MicroCenter for BEST PRICE PERIOD.
Pretty sure you can
They might, I know they offer build services. Best thing to do is call and ask. I build PC's, and might be able to help you if they won't
Thanks! Your answer is awaiting moderation.