Hi Rathmore, thanks for the reply.
I've seen this website before and it's been very useful.
I also found Peter McNamara's address on the old census records (1901 and 1911) and when looking a few doors down I found there was a forge located in the same street. A bit more digging (using the excellent Limerick council website) and I found that Peter was actually renting that property as well. It seems that in the off-season when the fishing had finished, Peter ran a forge in Meat Market Lane which is where I'm assuming he got the nickname of Iron Man/Smuts.
Unfortunately, in spite of finding out all sorts of nuggets of info like the above I still don't know when he died or where he is buried.