Thanks everyone - work has prevented me from making too much progress, but have had a bit of a splurge in the last week or so.
how did you make the rusty pylon, was it from a kit??
The basic frame is a plastic railway model electricity pylon, with the side stanchions left off., the walkway is a mixture of different grades of wire, with some plasticard and matchsticks added. The "mast" is a paintbrush.
Top work!

Nice to see you back at it! What's the idea behind the walkway going through the pylon? Is it a reference to some tv programme or film?
The radio transmitter is a bit of a nod to various films, games etc - it can be an objective, but the walkway makes it more practical as a vantage point across the island.