Here's actually my list:
CPU: AMD FX-6300 3.5GHz 6-Core Processor ($77.89 @ OutletPC)
Motherboard: MSI 760GMA-P34(FX) Micro ATX AM3+ Motherboard ($46.88 @ OutletPC)
Memory: Corsair Vengeance Pro 8GB (2 x 4GB) DDR3-1866 Memory ($49.99 @ Corsair)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive ($48.49 @ OutletPC)
Video Card: Gigabyte Radeon RX 480 8GB G1 Gaming Video Card ($239.00 @ Jet)
Case: Zalman T2 Plus MicroATX Mini Tower Case ($25.49 @ SuperBiiz)
Power Supply: EVGA 430W 80+ Certified ATX Power Supply ($29.89 @ OutletPC)
Optical Drive: LG UH12NS40 Blu-Ray Reader, DVD/CD Writer ($42.88 @ OutletPC)
RX480 stands in for RX580 (~6.2TFLOPS beefed up RX480) that will launch shortly (hence $239 instead of $219 for MSI version of RX480). CPU is still better than Scorpio's. Again, $560.
But, it seems you're missing the point. This is a mental exercise about production costs for fairly similar tech to figure out how much Scorpio might cost. My guesstimate is $449...but if MS is cocky they will go with $499.
What you made is mutch closer to the scorpio, the original discussion on the original hardware posted was just very wrong, and altough I think the scorpio will outperform the machine you made there, especially in 4K, I am also going to look at the price of the scorpio, it won't be over 500 but how close they get towards the PS4 Pro really depends on if they are willing to bleed to gain market share.
Sony has stated the PS4, Ps4 Pro and PSVR are all making a profit of the hardware, something which is really good for them since the hardware sells well either way, if Xbox wants to make a profit it will proberbly be priced at 499,- taking everything in account, their discounts but also taxes shipping and stores needing to make a profit, it will be a small profit if they have a good deal with AMD.
Either way if they are willing to bleed and price it at 399,- or 449,- and with the visual improvements the scorpio WILL deliver because of the 4k textures used on both 1080P and 4K screens it might finally indicate a small "comeback" for xbox. altough ps4 will still beat the xbox worldwide, no questions asked, they might reclaim the marketshare in the US.
It will be very interesting and I am sure we will have the answer @ E3, the main costs for Microsoft are the cooling, UHD drive and expensive memory apart from that it shouldn't be anything ground breaking in forms of cost, please also note they are adding a controller to the package, something that should be concidered in the price.