looking at the dimensions for the recommended Futaba NiMh pack at 84x43.5x17mm then the Hyperion FG305-2080-2S transmitter pack at 78x41x17mm will certainly fit and is available at £22.95 from;
http://robotbirds.com/catalog/produc...oducts_id=4728
On the subject of mixing Tx an Rx manufacturers I have never been personally comfortable with, the Rx supplied with the Tx does give you the full telemetry functionality, if you need it of course and is not hellishly expensive either, for once!