Here is the complete setup. The item on middle left is the belt tensioner and the idler pulley opposite it.
The belt took nearly two hours work and wasn’t easy. I ended up making the sprockets and pulleys first and then sketching the belt around them. I’m happy to have jumped in on this as I want to make a tank at some point and the tank tracks will be a similar task to the timing belt here.
I’ve learned a lot with this.