I am temted to do a similar thing with SMIDSY.

One of the problems I have with velcro for holding on armour is that you can't control which direction it will fly off. That said if it's a large piece designed to fly off it's unlikely to penetrate the roof netting as much as a spike or something similar.

Anyway, my thoughts on SMIDSY.

As said above run it on 12volts possibly running 12v Bosch 400's (if anyone has two spare!!). Stick a skin of 3mm ali on the outside set off the body with some rubber fixings so things can get underneath and rip it. The put a layer of 1mm ti on top so we can have some nice sparks and stuff, could get expensive if it needs replacing too regularly but we shall see.

Andy