Are you a chippy Grant? That's another REME technical term for anyone who deals with wood..... from a bodgy builder to a highly skilled cabinet maker! The woodwork is certainly good. Are they exact copies, down to the dovetailed ends etc etc? Do you have a dovetailing machine?
A 'tinny' is either a can of drink or anyone who deals in metalwork. From the roughest welder with an over amp'ed arc welder to the highest skilled machinist!