One thing about these JLTRT kits is that they go together quite quickly, but you still need to 'fettle' them to get a good fit of the cast parts. This particular build has taken a bit more thought as the motor supplied was not what the kit was designed for and I needed to make provision, within the inner bogie casting, to accommodate the Slaters motor/gearbox unit as well as squeeze in a Delrin chain drive. It eventually fitted, just, without compromising the integrity of the inner chassis. The photos show where I had to cut a hole in the bogie chassis to accommodate the gear box. The hole in the footplate also need to be extended slightly to allow the gearbox to swing.