These are detail parts designed to be used to complete my model of the 121 Class locomotive body shell, found here: 121 Class Body Shell
These parts have been designed to be printed in either FUD of FXD. I have also included bogie side frames for the flexicoil bogies.
Once I have decided on a file host I will provide links to a .DXF and .PDF to allow modellers to accurately cut out a roof from 5-10 Thou plasticard.