I'm in the process of completing my trainer. It's a Sig Kadet MKII, and there is really a large amount of space in the front around the tank. I currently have it resting on some scrap 1/4" with 1/2" foam in the sides to absorb some of the vibration. I thinking about gluing the tank down to the two cross braces I installed to support it. Is it really that bad of a idea to glue the tank down. My only other option which was to fill up the front of the plane with 1 1/2" of foam which I thought would probably add more weight then the two small pieces balsa. I'm also leaning a bit towards increasing the tank size to 10oz-12 oz to fill up some of the space instead. Any thoughts??