WALLS
I have used several different methods for constructing the walls of the models.
For the 1930s road wagon, I followed the instructions that came with the MFD plans.
For a start I had never made a wagon before so I had no idea of the best way of going about it. The walls are made up on a set of formers with an inner and outer skin in much the same way as model aircraft wings are built. It looked fine when it was completed and you can conceal wiring between the layers, which can be useful.
For the Orton, I used another method. I used 1/8th inch ply and veneered the inside walls with Mahogany. The outside was left plain except for all of the panelling, which was outlined with 1/32nd inch ply. The inside walls were marked up for the panels and they were outlined in 1/32nd inch thick Mahogany. All of the furniture was made before any of the walls were glued in place. With this model, there were two internal partition walls one with a full size door into the bedroom and the other had sliding mirrored doors into a child's sleeping area. These were both completed before fixing into place. These partition walls did help to make the overall structure more rigid.
All of the pieces that made up the interior were completed and varnished before being glued into position. I tried to make sure that any areas which I knew were going to be glued, were left clear of varnish to make the glue adhere better.
The bedroom had many paintings on the walls and I painted each picture individually on 1/64th inch ply and glued them into place before fixing the walls in position.
The Tube Shooter was made in much the same way as the Orton except for the outside walls, which were boarded, and I think that the Photo is self-explanatory.
I had a problem with the walls of Eccles becoming bowed. I used 3mm MDF with Mahogany veneer glued to the inside and 0.4mm ply glued to the outside and I am sure that using two different materials on such a thin piece of MDF caused the distortion. I overcame the problem by using 3mm aluminium instead of MDF and used an impact adhesive to attach the ply and the veneer. Once the ply and veneer were in place, I was then able to use wood glue to attach wooden items. I have used this method for making doors (with thinner aluminium) and it has worked very well.
Wall of Tube Shooter showing construction details