Will this PC run Unreal Engine 4 well? (US$4000)

Your system and the amount of money you’re spending are well over the top (and as others stated, almost looks like you just want to brag…)
I recently built my own system, assembling it myself for about $1500 (Australian $) and it runs fine, with my only likely upgrade being another 8gb or 16gb in the near future (currently sitting on 8gb which is fine for gaming).