Subj. 
Why? Because I am doing it also, and it’s quite fun - a lot of ideas, a lot of imagination, a lot of hope and experience.
I have started this project about 2 weeks ago and I am doing it in my free time. You can follow my progress here, if you like
My interest is what have you achieved, what were the difficulties, etc. It would be nice to share the experience.
Cheers!