So many ideas, so little time and energy.
I'd love to do ALL the fire trucks. One from each country. One of each type. Tankers, pumpers, on road and off road. A nice classic MAN airport fire truck, a classic Oshkosh, modern Panther. But also, I'd love to build an exact copy of the Scania one and do a post-apocalyptic modification. Rust, gray camo paint, spikes, dents, armor plates, window protection.
And also, I just found out about the M1142 Tactical Firefighting Truck.
https://www.flickr.com/photos/mark6mauno/34788834526