Thank you Blackbird.
What do you think about the top in black color ? For me, full yellow ... is too yellow !
I have a very easy access to the battery just 4 pin retain the top.
If anybody want more photo, with disassembly parts, i can do it.
The main mechanical structure is the same in the GMK instruction's. If think, it's the same of original 42009 by Jurgen no ?