I've just skimmed over the both specifications and haven't noticed anything that would indicate that this is a "weekend project". In fact, I'm impressed enough

I've just skimmed over the both specifications and haven't noticed anything that would indicate that this is a "weekend project". In fact, I'm impressed enough that I might work on an implementation in my preferred language (assuming a decent testing dataset is available). What exactly are the technical issues that make you dismiss this project so harshly?