My IIfx lives most of its life open-topped and I'm concerned that it might not be cooling properly because of that. I haven't had a problem with RFI. I'll definitely be giving it the stock cooling vents as well as the card supports. Installing an internal Zip and having access to the internal CD without removing the lid would be third and fourth on the list of reasons why, with elimination of wear and tear on latches in the back being the fifth reason.

The Mac II series is too tall to support any monitor that's large enough to it justice. Apple had to build a support for those who didn't have the desk space to set a large monitor next to their Mac II where it belonged. After trying the Portrait on top of the IIci back in the day, I gave up on that as well, it was just too high.