The turret is the same one that was eventually used on the Challenger A30, it was from a design perspective easier to use what was developed for the TOG2 then design a completely new turret for the Challenger in the time they had available and with limited resources.
However this is a different casting to the one found on the Challenger model. It looks like it should be pretty simple to put together, but first to clean up the metal and resin castings.
Having cleaned up the castings I glued the models together. There aren't too many parts so they went together quite easily.
There is very little extra stuff on these models, and unlike other Flames of War boxed sets these are three identical castings and not individual ones as say you find with the Panther boxed set.
One of the models I built with the commander out of his hatch.