Well said Zetro!
And i agree, the HXC while nice, is a little expensive. Your suggestion for someone to produce a cheap Gotek Emu plus LCD and buttons for the Amigas would be a very popular solution i think.
Also the thing is it's quite easy to pickup an Amiga case of ebay etc, use that for modding and cutting and keep your original case spare and in prestine condition, for if you ever wanted to revert back to your original non modded one.
Or as you mentioned make an external boxed unit of some kind.