yes you can get pre wired jst plugs on ebay exactly like the ones used on model in 2/3/4 wire configurations right up to 10 wires i used 2 wire jst plugs to extend all my switches
i guess it's fair but sometimes parts are just easily broken whether you're careful or not especially if instructions are wrong like the rain covers mislabeled etc
ive used humbrol 19 gloss red which is pretty good if you want an even closer match there is this https://www.hiroboy.com/London_Routemaster_Bus_Red_Paint_60ml--product--4644.html
but i haven't tested it myself
i wouldn't worry too much as there is a solid metal frame skeleton that fits to bodywork and roof that's then secured together that will hold everything secure .. i have sausage fingers too but just got to take things slowly
hmmm i will probably just leave mine too much hassle but you may be able to get something off ebay or buy a 5mm led similar size to those pods 3mm led fits in and rub surface with some fine sandpaper to give it that slightly opaque look
omg how did i miss that i never even noticed that was missing why on earth didn't they put 2 leds in when they did on lower deck that's obviously a design cock up .... well spotted triple V