Dell does not provide pinouts ever.  You would not save anything by trying to use proprietary Dell Case and Power supply.
I'm thinking of putting Gigabyte A5201 AC mini-ITX motherboard in old 7010 SFF. I can handle making my own mount points but do not know which connections are proprietary and which ones will work. I believe PSU will be fine as chosen mobo, cpu, cooler and gpu are estimated at 168W. [NAME] I was looking at your answer to [URL] and hoping you may share some knowledge. Other than Pocation 5pin to 4pin connector and screw set what might I need ? If I can make this work I can have a decent work station for $400.
Gigabyte motherboard in an Optiplex 7010 SFF ?