If I have to go this road, and this will be my last resort, I would use the links as illustrated, the rollers would be 0.5mm brass tube and the individual pins to hold it all together would be 0.3mm brass tube, the pins would slide inside the roller tubes. Total width of the chain including rollers and links would be 2.0mm. It would be a very intricate thing to put together but it is possible, it does not have to be a functional chain as it will be there for show only.
All I need is the name of a company somewhere who could produce the links for me in the sizes I have mentioned, I know there are a few companies who do orders but I don't have any contact information for them.
I am still awaiting the arrival of the 1:24 scale motor bike chain which is a PE chain set with individual links, rollers and pins and is a fully functional roller chain, but like I said, I don't know the size of this chain so it might be too large.
Des.