"all in one" fish finder mount

[double p]

i just bought an elite 4hdi (thank you flemdog) and i need to use an arm mount to mount it on my malibu. i looked on youtube and found this: dude put his ff battery in a pelican box, then mounted the ff on the lid, and mounted the transducer arm on the side of the pelican box, and then put that box on a ram ball mount on a track. i like this set-up, but what are the cons?