The strips of wood are for both the outside of the sides and the roof.
In the case of the sides there is a ply 'slab' side which is covered by the strips glued in in the vertical direction. When the glue is dry the excess timber is trimmed off.
The instructions do not give the dimensions but the photos do show an irregular overlap so, providing you don't go mad with the lengths, I assume that there is more than enough timber for the job.
The lengths are to be taken from the actual side rather than using a ruler.
Even though I haven't removed the white metal castings yet they do seem to be rather well made with little or no sign of flash.
Regarding the fancy artwork, #82 is, indeed, the inside of the roof and the instructions recommend varnishing it when the glue is dry. I will probably do this.
The control panel I will probably replace with a black plastic one so that I can fit working lights and such.
Not sure about what to do with the other bits ----- might scan and print as a decal or might just plank the ends and varnish.
The artwork is just a sheet of 'ordinary'paper ----- and as I said before ---- very disappointed.
The instructions have a couple of booklets. One is a series of colour photos that show the various stages and the other give a written description in five different languages ----- Luckerly for me one of those is English
The second tram is the "Tranvia De Berlin", kit #53004 and as yet I have not even removed the outer plastic wrapping yet so not much to see there.
The OcCre site has more details of it at:-
Must admit that I am looking forward to the build when/if I ever get the work bench clear
(although not sure when that is to happen !)