Alternators Wheeljack problems

I bought myself an Alt Wheeljack today, thinking it looked pretty funky in the box, but now I'm thinking it may not have been such a great buy.
I think I've managed to transform him once without bits popping off - the arms remove themselves pretty easily, both at the shoulder and the elbow.
I also can't seem to get things properly lined up when going back to car mode - either the top panel and back don't connect properly (the roof sags a little), or the doors and floor don't line up properly.
Are these known issues with this model, do I have a badly assembled one, or do I just need more practice with the transformation?
I think this guy is even more fiddly than movie leader Megatron's leg assembly
I think I've managed to transform him once without bits popping off - the arms remove themselves pretty easily, both at the shoulder and the elbow.
I also can't seem to get things properly lined up when going back to car mode - either the top panel and back don't connect properly (the roof sags a little), or the doors and floor don't line up properly.
Are these known issues with this model, do I have a badly assembled one, or do I just need more practice with the transformation?
I think this guy is even more fiddly than movie leader Megatron's leg assembly
