Good deal. I was a backpacker and later got into bicycles. It was an easy transition, just roll instead of step.

My only advice is to try your system out by doing some weekend trips just to make sure everything works well. A couple of heavy items I carry: U-Lock and a cable lock. Ya, I know anyone can defeat these and they are a pain to deploy but they make me feel better. I would also replace the bivy with a two person tent. I use a Tarptent. Small spaces not for me! If your not carrying a sleeping bag, try it out on some cooler nights to make sure you don't need it. Cold is not fun.

When away from the bike, always have your wallet, keys, phone, etc. with you.

Enjoy!

Jon