Hi,

This may be a bit extreme, but perhaps you could take a much more common beige Mac Plus, chop it's handle off in approximately the same place, and somehow JB-Weld/chemically bond that into the void left in the 512K ED.

It's a lot of work, and may not look absolutely original, but it's worth a try.

Alternatively, you could leave it as is and install a big fan in there. These machines need all the help with cooling they can get.

Congratulations on your find, though!

c