You obviously have not thought this through in a worst case scenario. I mean that thick overly protective plate is just something that gives a zombie something to grab onto. And if you fall! Man try getting up with that and a gnashing clawing deadhead on top of you!
Seriously though nice armor and I'd like to to have one or a couple for serious SHTF situations not involving zombies but for HD I'd be concerned with getting into a struggle in it and having all this weight on me. I know you'd hope not to be in that situation but sometimes you cant dictate where the bad guys are. Have you tried practicing rolling around with it and a large mass on top of you? I think that would be crucial training if you have equipment like this. If you do post vids! It would hilarious to watch either way.
And let us know how the testing goes!
EDIT - was trying to be facetious but reading this over I see it could be misconstrued. Plain talk - Great looking piece of gear, practice with it especially while in all sorts of defensive positions.