A metal box must be better,because it's more beautiful and also be a better heatsick.
You can buy a metal box like this
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
Ofcourse a metal box will be hard to cut[s:275]

En,you should use more thick output XXXXXXX ZVS's output line is 16mm^2[s:274]


(I'M sorry about the English page because the computer i'm using doesn't allowed to write in simple Chinese,please don't laugh at my poor English)