I agree with @den.ted in the fact that putting that much into a 10 year old machine may not be a wise move.
Personally I have a 2011 MiniServer that in the past I originally upgraded it to 16GB RAM and several years ago as I was upgrading other Macs that I had previously updated with SSDs and updated again to larger SSDs and the SSDs removed from them were put in the 2011 Mini Server. At this point in time, however, it is quite rapidly losing its usefulness as newer OSes, newer apps, are no longer supporting the hardware, even since it has been relegated as a media center.
Based on my experience, putting the money for a memory upgrade and SSD into a 2011 quite frankly would be a waste and that money would be best used toward a new or newer Mini.