This looks to be a great kit but studying the instruction I get the distinct impression that the author has never built a model. The method of constructing fully detailed subassemblies and then assembling those (fragile) subassemblies into the final forms strikes me as a recipe for disaster.
Maybe I am mistaken and the author is a master craftsman who produces award-winning models. I'm not though. I am a mere assembler of parts with a fair amount of skepticism who likes to have a firm base before proceeding to the next step.
I want to see that the major components fit together before festooning them with delicate, awkward details that could be knocked into oblivion with one careless brush or bump.
I think the key to these tracks is to start at the drive sprocket and work your way around to the front idler. The fit of the individual track links into the sprocket is precise. Placing the links around the idler is not precise and can lead to problems. I believe it's best to plan on assembling the entire track run in one sitting so adjustments can be made while the glue is still wet.