Upgrading Dell T7500

I am contemplating purchasing a secondhand Dell t7500. It has 48 GBS of ram and an unspecified Xeon CPU with a Quadro 600GPU. There is no hard drive.
I wanted to ask would it be reasonable to add a SATA SSD and HDD, another Xeon CPU and adding my Asus HD 7970.
To add the HD 7970 I will probably have to use 6 to 8 pin connectors so I can connect the HD 7970.
Any info or experience in this topic would be great, thank you