@Kal, go for it, the visibility is SUPERB!
@Jason, every thing is pretty much curved already since the cans are oval shaped.
The sizes are: 13 gal and 8 gal, remember to get the lids since they are included in the price, I forgot to get them and could have used them for other things.
Just trace your pattern onto the can and use a dremel on medium speed to cut them out, BUT WATCH OUT FOR FLYING MOLTEN PLASTIC, it'll leave a mark 
When you paint the cans, you can rough them up with like 200 grit, then prime and smooth or just use Krylon Fusion as your base, then layer.
If you want thicker armor, make it 2 layers of can and either use GOOP or something for plastic to stick them together.