I've been working on a concept but ended up starting late and have been trying to find time around work.  I can now see is way too big in scope to get done in time with all the other things going on.  Is it too late to switch gears onto another, more simple idea?  Anyone else in the same boat?  

Yup, I guess it is not too late but as PedroGeraldiAguiar said, you'll have to think about how to reuse what you've already done to save some time if you can :)

Good luck bro' ! Don't give up :D