Is my new design workable?

this is one of a couple i just drew, and i need feedback. excuse the quality, i had to scan it.

ignore the sides of the cube in the middle, the drill locations are messed up. (i need more white-out)




Thanks for any ideas for improvement, i will update the pic soon with a couple i thought of after i scanned it.

i'm not sure I fully understand. could you try posting a pic where you shade the block wherever the material will be and leave it unshaded where there will be channels/drilled holes?