You should read up the Hooben Merkava thread and draw your own conclusions - at over $800 even RTR, there should be some expectations.

Aside from the mentioned Ludwig conversion, Carson of DKLM RC has put out a 2A4 turret kit intended for the Heng Long 2A6, but it lacks the requisite driver hatch conversion parts, or the correct side skirts, which are the major visual components of the conversion.