I'm in the later stages of building my first Senior Telemaster. Besides using it to drop candy and take pictures I'm really wanting to use it as a glider tow plane. To that end I'm planning on sorta overpowering it with a Saito 180. Now comes the problem - I'd like to install a 20 oz (minimum) fuel tank so I can get more than 5-8 minutes of flight time but I can't find anything off-the-shelf that will fit in the 4" x 6" fuel compartment. Can anyone give me any help for building a fuel tank or links to companies that have custom built tanks?

Thanks for any leads,
Tim