Also, you mention wanting the top vent of the Plus. But you also mention running a hard drive. I hope you are not planning to run your SE with a hard drive, but without a fan. If so, you should really consider going with an SD solution as the hard drive will really overheat the ability of the convection cooled Plus case. If not you will obviously have to relocate the SE fan.

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The main reason I wanted to replace the entire back plate was to allow for the standard fan port on the back, but also retain the convection vents at the top. I had also planned to cut out another hole in the case directly across from the existing fan port and mount *another* fan there, which would draw up more air out of the case but overall is really just for the purposes of the case mod itself (since it would be only too cool to have a "twin exhaust" on a performance built Macintosh SE).

I'll think about it anyway. Both machines are back in their standard cases right now.