Hello,
I'm sorry but I must strongly dis-agree with this method, with the following reasons:
1) The box you made, whether plastic or metal, is difficult to seal and any water that gets into it (a big leak) allows electricity to get into to sap anyone just so happened to be standing on the wet carpet (a very likely scenario for anyone attempting to contain the flood). Now most likely the flood would have shorted out the circuit and caused the breaker to trip but then again, 2) below does the same job and is much safer.
2) It is much safer to install the actual GFCI unit on the wall, and then run an extention cable to the stand.
Titus
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