Fujitsu Esprimo D738/E94+ new case ATX case for NAS server use

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Hello,

i bought a Fujitsu Esprimo D738/E94+ and want to use it as a NAS Server. Can i take the hardware out and place it in a normal ATX case? Am i seeing right that the ON/OFF button in soldered on the mainboard?
Modell is Fujitsu Esprimo D738/E94+ i3-8100(4×3,6GHz), 16GB Ram(2×8GB), 256GB SSD. It has only 1x 3.5 inch HDD slot an i need minimum 2

Thanks for the answers