As I have already advanced in the comments regarding the last vet and the lighthouse, I find that Lego has made great efforts on the solidity of the construction of the series "Lego Friends": once mounted, the balloon and its basket hold up, even when girls try to keep it at arm's length and almost the fingertip to pretend to fly! The top is very easy to mount: my daughter 7 years and half arrived there alone. Otherwise, for the whole ballooning costs around 15 to 20 minutes of assembly, and 10 minutes to the patio that accompanies it. Very reasonably assembly time for an admittedly very small profit (yes! Lego Friends is still tiny, ballooning measures just over 20 cm tall), but that is more visually the model that the toy collection ! But how can a girl resist the urge to play with a thumbnail and as colorful as realistic?!?