Ok so i only read up to the end of page 2 so I dont forget what Im going to say... Doc, the process takes a while as there are custom bootloaders and stuff to do, you might as well do multiple HDDs and do a DUAL BOOT system, which is extremely easy, if you can get OSX running on the Hackintosh the no doubt you could dual boot Win7,8 or 10 that you can select on boot startup.
Also Doc where is the El Cap DVD going to be installed?
EDIT: about the trash can Pro, it is so damn expensive because Apple are using WORKSTATION grade hardware, thats the entire main focus on the Pro. Doing a Hackintosh for any of the main Mac units is the same thing but just CONSUMER grade hardware. Plus you can start small at something around $1000 and go as high as the compatibility list can go!