Hi. Can anyone please help. Am trying to build an a4 mallard steam train but cannot find any practical advice on how . I’ve found lots of nice pictures of built a4’s online but no tutorials or instructions. Very frustrating as I am new to this hobby. I know it’s not an off the shelf project but I don’t know where to start or even what types of pieces size, quantity, where best to buy, etc. Drawn a blank so far on clear concise advice. Please can someone help.