Ingenious.

However, I'm not too sure about the heaviness of the X ... it looks 'uncomfortable' amongst its fellow glyphs.

I like your solution for the X, but I still think its diagonals are a bit too heavy. Maybe they would look better if they were the same as the diagonals of the other glyphs ... although that is just a personal opinion :)

I gave it a 9/10 ranking, but the balanced score is only 6 - hopefully this will rise when other people vote.

I think that looks so much more balanced ... well worth the effort :)

Do you know about brick-stacking?
It helps by enabling the creation of new shapes through the combination of existing brick shapes. djnippa has done a great 'how to' page.

http://fontstruct.com/fontstructions/show/ncd_brick_stacker_one_grid

Hope this helps.