View attachment 169846
I have lined the one side and the two ends of the body with some laser-cut plywood from Poppys Woodtech. The planks are broader than the ones on the outside but the overall effect seems ok to me.
The plywood parts were intended for an open wagon so I made quite a lot of joins. The only one I can see in the photo is at the top of the end and this is invisible viewed through the open doorway.
The colouring on the ply is some Tamiya acrylic thinned into a wash. I had expected to get a darker colour but somehow what I have ended up with seems about right. The main thing is, it looks like unpainted wood.
View attachment 169847 The roof turned out better and easier than I had feared, but it isn't detachable. I don't think it needs to be.
The former for the curve was a 100g tin for Kenco coffee. I used masking tape and Sellotape to hold the piece onto the tin - the masking tape was a good idea, the Sellotape left a residue of glue which took some effort to clean up. This assembly went into near-boiling water for 4 minutes then cold water for about 10 minutes.
I have had a few goes at forming styrene into a curve in the past and I usually ended up with wavy edges. This time they came out almost straight and the solvent holding them onto the body has left them completely straight. I think the trick is to tape down the entire surface of the styrene. The periods of 4 and 10 minutes are completely unscientific but seemed to work.