good mod. I did this too to my old 360. Hopefully it'll give it a few more years!

In my opinion most of your points are valid only on the first gen GPU heatsink. If the GPU heatsink is 2cnd gen, you should do the mod on the CPU too. I even added a fan to mine. I mean 90 % of the GPU heat goes to the minature heatsink right in front of the console, so if you put a fan there then the hot air from the GPU will go through the CPU heatsink and out.

I did something almost exactly like what you show in the video however im getting plently of hot air from the CPU, very lottle from the GPU and when i took it apart and inspected it there is VERY little air entering from the front of the heat sink, i have sealed off all entrences i can think of and it made little difference, do you have any ideas? Its a XENON like the one you have.

if i use hot glue to fix the cardboard it will melt ?

I’ve never had the rrod the only time is if it break mine day hitting it with a controller

So is the xbox still working?

JUST USE ALUMINUM TAPE. Dont touch any of the board components

Good fire hazard, cardboard really!? xD Use something that won't burn up and catch on fire. I mean like why would you put a cardboard cover on a heat sink!? :)