There is an 'official' Jagdpanther conversion kit for the Heng Long Tiger and Pantiger from Imperial Modellbau.

It looks fine, but It's unclear if you have to keep the (larger) lower hull of the HL or not (which would spoil the final result, imho).

http://www.imperial-modellbau.de/shop/index2.htm


Click on 'Details' and then 'weitere Bilder' for detail pics