I'd be a bit sketchy about leaving my stuff out and visible but running a cable through everything should do the trick. You may need to hide your gloves or just ride in with your MTB gloves on.
Rack wise I'm jealous of you guys who've built your own solutions. I'm a bit less handy but have found 2x2cycles who make a nice set up for many bikes. Not a thread hijack, just wanting to pass on the info to some other cyclists.