I just did this with a USB CD Rom. I wanted to do it the BartPE method of starting up the setup but I couldn't get it to work. I have the bare minimum specs for the mini and the install is around 1gb of space with nLite. The page file was 2gb when I first started it and I'll be trimming that down to 512mb until I get my 32gb SSD
. It runs fine, a little hiccup every now and then when it hit the ceiling on the page file but no complaints.
You can get by with the original 4gb SSD
but you'll want to upgrade. It's a little weird to have 2gb of memory and only 4gb of drive space.
Also wanted to mention this may push your ship date back, atleast for me it did. Linux based systems seemed to be shipping on average 1.5-2weeks later then the windows versions.