Big thanks to Paul Chetter, a parcel arrived this morning with a Zimo sound chip and a selection of speakers to try to see which sounds best in the Hymek. Liking the look of the big round one to go under the fan

 

 

Also cab roofs are getting there, vents are in place, just need the airhorns then I can get them painted

 

 

EDIT: Cab roofs fitted out and painted, couldn't resist adding the pipework to the horns ....