Seems like overkill to me...If I needed something that can be rolled over by a truck I'd use one of my Pelican Micro cases.

That being said, kudos for going the DIY route. Personally I'd go with something with thinner walls...a bit less beefy.

If you Goggle 'Clear PVC' in the pursuit of making a less IED looking model, make sure you're careful about the links you click on unless you need a rubber nurses uniform too.