That's indeed a good way to remove the sandbag in wifi room based stages (I think that's the rel file PW made for his expansion code), but... Wifi room is not a good stage to base stages on. I mean, there're other issues such as some final smashes (see what happens with pit's)
That's why, I mean, it's better using a FD rel file, in which there are no sandbag problems and no final smash problems. To make a wifi room based stage compatible with FD, you only need to add a modeldata2 to the wifi room file, and make it have an empty model such as the poketrainer00 one. Importing a pre-made brres file with only an invisible model would make it ^^U
Furthermore, as that's a NTSC wifi room rel file, PAL users won't be able to delete the sandbag (the rel will make the game crash), but using a standard FD rel file would be possible even for PAL users ^^U
As a PAL user i know how it sux when the game crashes due to rel files. PSA's are also not working 100% cause of the sound not being there. The only PSA who has that is the PAL ported Shadow (which is good btw).
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and good luck on your finals
. Once he gets rid of it we will be back on track though 
and this tlink is just a 999% dmg dealer...