Shamelessly I have pinched an idea from Nigel, one of our group members. This involves drawing round the compartment side of the coach which gives us the layout of the compartment spacings and a corridor compartment template. It is a matter of painting around the lines and hey presto we have a useable interior.
The floors have been marked and cut out and I have a supply of suitable seating. These need to be cut to length and spaced to form the compartments. A quick paint with acrylics and the interior will be done.