Aiiiii! Not sure that's a good idea at all. Pulling air from the top could interfere with exhausting air from the inside as well as draw in higher warmer air in the room, and theoretically pulled in from the exhaust fan's output in the back.

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Never thought of that. Point definitely noted, it leaves me restricted with some of the modifications but I can't really compromise ventilation inside the shell, being tightly packed enough as it is. I'll look into this a little more when I have some free time.

Frankly, I would stick the whole thing in the Plus, cut out the port panel, and otherwise do as little modification to the case as necessary. If Apple had glued the port panel on in the first place the way the top vents are, the upgrade from the 128K to the Plus would have been a lot less wasteful.

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Well less is more, so the less I can modify then the better. Hopefully I can still get a killer result though. As I look more and more into what I should and shouldn't do, it starts to look like I won't be able to do much except mod it slightly and then paint it.

I keep looking at my iMac G3 and getting ideas, but I don't have injection moulding gear handy so to speak...