It rather depends on what you want to make them from. If you can get away with plastic or wood then one of these would do the job using stripwood, plywood strip or plastic strip 4mm wide.

**LINK**

I have one and find it really useful for all sorts of cutting jobs. You would probably need to drill the hole by eye or by using a simple jig but that shouldn't be too difficult.

If they need to be in metal then it won't be so easy although I expect someone will have a suggestion.

Colin

Dave,

As an alternative to drilling holes and fitting real rivets, you could simulate them with a spot of thick superglue in each corner of your base plates. Alternatively you could impress the rivet heads from the back of the base plate using a tool made up of a small block with 4 pins, similar in principle to the process I used on Spider J's hull plating shown here.

Another option would be to use photo etched rivet heads stuck in each corner. I have not done this to simulate rivets but I have used it quite a lot to simulate bolt heads and tails

Gareth