Minecraft Tetris, Out of Redstone

Counters! I made a simple counting system, and have mapped it out so I can apply it to the machine. This will act as a memory system, so if there is a block falling and there are blocks under it, the machine will know and will stop the block from falling. The new problem is the fact that the machine only knows individual pixels, not that these pixels are a part of a whole block. So, the different parts of the block may stop falling at different times depending on the terrain it's falling onto. So I need to find a way to fix this if I hope to make this actual tetris.
Along with the counting system, I have mapped out a simple way to show the machine when a horizontal line is full, and to let the machine destroy the line. and I have made the counting machine so that if the line is destroyed, the blocks above it will continue to fall.
Another new problem is that I need to make the left and right gate apply to only the falling block, not the whole system which is the way I've planned it so far. Anyway, I can see a prototype coming soon, the two problems I've mentioned in this will make it legally tetris, and other bugs will be fixed too with the clock thing (which I'm still planning)