I have the kit 42030 used for the construction of Dumpers A25F. The functions "Drive", "steering" and "tipping" are perfect. For the transport of bulk goods, the device is, however, not be used due to the non vohandene bottom and side walls. To remedy this deficiency, I have made of 1 mm thick aluminum sheet a three-part kit. This consists of the elements "floor and bulkhead" and two "sides" The first element is inserted into the hollow skeleton loose. The two side panels are each secured with three brass screws on the right and left sides of the trough skeleton and hold the loosely inserted soil determine the necessary cut-outs in the side walls and on the face plate of the soil can easily be made or a simple jigsaw means "Dremel". Now playing is really fun!