Two things to watch out for..
1. Is the plastics UV stable? - If not will need to paint them for protection / longevity.
2. Check if the resistor has ferrous leads.. If so, pot / seal the resistor and connections in some way. - Very thin steel wire will rot-through in a season if the damp and air can get to it.. don't ask!
Other than that, they look pretty good..
There was a ?German? firm at Warley doing (amongst other things) a super-duper version of the Faller road system for moving vehicles.. They did other automation bits, and their guy had made some very nice large signal heads for their display..
If they were a product, they could have shifted a lorry full!!