^ it will fit an an matx case.
The issue is the front panel connectors , Dell's connector block is non standard.
Meaning you have an issue getting the power & reset buttons on a standard case connected to the board.
Is it doable ?? Yes absolutely if you can find a pinout diagram for the board , & you don't mind snipping & reconnecting wires from the old dell case connector into the new one.
It means butchering the cable,son the new case though IF you can find a diagram for the board.