You didn't use.the iron itself to pick your noise did you?!?!?! I've burnt myself with an iron too, I borrowed one from my step-dad and it didn't work. Months later plugged it in not expecting it to work again and stupidly picked up the coil stand that was rather hot. "Insert swear words"
As for wheels, I will admit I just copied Ellis for my first build. The nuts not straight but it works and I'm happy with the result.