haha... you should say that you use patpat's as base since mine used his lol..

making gameboot is just like edit/compositing normal avi video.
i usually use adobe after effect for editing the video and render it to soundless avi. audio would be on different file in .wav format.
then you just need to merge and convert them to pmf (you can google how to)

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as for object disappearance you can learn about it from tseneda's slideout test ctf
this command is kinda complex,, so i haven't applied it yet

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edit : animation idea: blinking/rotating sunlight reflection on the building roof?