I've noticed a lot of scratch built titans with amazing rivet detailing on dakkadakka.com and I've not actually seen any rivet detailing tutorials, so since I'm attempting to make my own titan, I thought this might come in handy as it has come in handy for me... you'll need the following 3 items
An adjustable leather hole punch (I picked mine up from a poundshop, but you can get them from any clothes making stores)
Some scrap plasticard (I used the plasticard from my cockpit section) and not pictured some wire to poke the rivets out of the hole punch
Pick up the leather hole punch and select the smallest hole punch, for me the internal diameter is 2mm, which I think is perfect for titan rivets.
Go nuts on the plasticard, punching as many holes as you like, a method I found that really works is if you rotate the plasticard side to side for a perfect cut (I would suggest making the rivets in batches of 5 a time though)
Use the wire to poke out the rivets out of the hole punch and enjoy your new set of 2mm rivets.
Short, sweet, and straight to the point, feedback welcome