On the front and back ends (remember, the front and back of the tram are identical), you form the curves on the face panel by gluing in a series of 2x2mm basswood strips. Sort of a clunky way to do it, IMO. I think a better solution would have been some thick cardstock, which would form a nice, smooth curve. Doing it according to the kit instructions means I'll have to fill the gaps with Bondo and then sand the curves smooth. Maybe I'll just go ahead and cover everything with some cardstock anyway...