RE: TD .049 powered trainer and wedge tank location.
Karol,
I empathize with your plight. Do you know what is wrong with your Babe Bee? Perhaps a simple parts replacement will put the old gal back into flying trim. My link to the Cox web site appears to be broken, but perhaps someone has a good one.
Additionally, one can usually pick up Babe Bees and parts relatively cheaply at (GASP!) eBay. Don't skip the the engines without tanks. They can usually be had for less money than the engines with tanks. They will bolt on to your existing tank with no modification. At the very least you may end up with a new glow head for less than the current price Cox charges. See:
[link=http://search.ebay.com/cox-engin_W0QQfkrZ1QQfnuZ1QQfsopZ1QQsatitleZcoxQ2aQ20e nginQ2a]Cox Engines[/link]
Maybe your engine just needs some TLC after sitting a long time. Maybe a bit of fuel in the cylinder will loosen it up and breathe life back into her.