Hi RT, Your photograph shows two classic Heng Long faults, both of which can be resolved with a little work,
First yet another problem with a Heng Long Cupola,
It is mounted wrongly,
To fix it you need a pen knife blade and a small file and a dab of superglue.
The cupola hatch hinge should be at the 20 to 8 position as viewed on a clock face, this will bring the viewing slit looking directly forward.
The cupola is lightly glued in position,
To remove it slide the blade into a viewing slit and gently I SAID GENTLY work the blade lifting and lowering then place the blade in the opposite viewing slit and do the same you will hear a cracking noise ,Don't panic it is the glue failing.
lift the cupola off the turret ,You will see a locating knob on the underside of the cupola and a matching slot on the Cupola mounting ring, Both the knob and the slot are in the WRONG PLACE,
File down the knob flush with the base of the cupola and remount it in the correct position, when you are happy dab a little glue on the base of the cupola and fix it in place,
You can leave it unglued if you wish it will not readily fall off.
The other job is a little more taxing but patience will win the day.
You will need a craft knife and a small halfmoon file.
There are two aerial stowage tubes on Heng Long , Torro and Taigen Tiger 1s, there should only be one.
The one to remove is on the left rear side along the engine bay as you look forward.
Gently work the craft knife along the length of the faux stowage tube, if you are lucky it will simply peel off in one piece but you may need to use the file,
You should end up with a scalloped curve where the aerial stowage tube had been.
This is a job that rewards you more the less force you put into it.
Good luck.
Shaun.