Thanks for the info, this is what I thought but couldn't really find a definite answer in the manuals.

I think I'll hold of on the refueler thingy for the moment, although it's an intriguing little piece . It's just that the fuel line to the carbrator seems to be quite hard to get to when all's installed so refueling may be quite difficult. But I'll see how it goes in practice.
In terms of keeping the engine in place, I was thinking of using a few 1/4" sticks under the tank but then somehow need to prevent it from moving forward/backward and sideways. Would you recommend buidling a fancy 'harness' for the tank or is it better to just stuff the open spaces with some foam?

Thanks again and looking forward to 1st flight (well lesson)....

Johan