Hmmmm...the 42042 was what he worked on at his camp. He really enjoyed it. Can you only make one thing from it? Or do different "modules" mean different set ups, but all with the same kit?
What do people mean when they are talking about b, c, d etc?
Should I also be buying motors?
After reading I think I am stuck between 42042 and 42054, only because the PV site sells instructions.
Thanks for all your help. Even after reading I am still a bit confused. Definitely not my forte but I know he will love it!