Already looks fantastic. I wondered were you going to add that extra detail to the top - of course I needn't have worried.
I think the barrels will stand out beautifully on the shelf. Between those, the dolly cart and the teargas launcher there's a great T2 Cyberdyne theme going. Maybe you could actually advertise them as a grouping of accessories - ''Cyberdyne Demolition''.
I get the biggest kick out of adding in every detail possible, so yep, there was never any doubt
Only thing I have to figure out is production. Having even one 1/6 scale barrel printed is pretty expensive and would make it prohibitive in my opinion. So I have to decide if I get a print and then cast or do something else. A barrel would be a pretty good thing to try on my personal printer, so that's probably where I'll start.