I don't really have any links but people doing CL are used to making these out of thin sheet metal.

It is also possible to use almost any plastic container, like a film can for instance (a bit small in volume here though). By heating an undersized wire you can melt holes in the can so that you have a tight fit when pulling a silicon tube trough it. It may sound odd but it seals well.

You could also use balloon tanks right behind the fire wall. These would adapt to the space available, are lightweight and provide pressure to aid the fuel draw.

There is plenty of information on the 1/2A forum. Try the search function or simply place a question there too, lots of experienced people there that might not follow this conversion forum but would surely be interested in a 1/2A twin endeavor.