[...] never use it again because the layout is not practical at all. It would sit in the closet [...]
The layout is no better or worse than the standard modern ANSI/ISO keyboard. Maybe marginally worse on the bottom row, since the spacebar is so silly big.
I would probably move the right hand letter keys over by one column, like:

And it would certainly take some work figuring out how the logical layout should work, with some functions moved on to extra layers. Definitely not insurmountable though.