Of course you are right, someone must start with something simple, but that "Danio" is so ugly I would not like to have it on my shelf :-) But for training, that makes sense.
One reason why I have stopped building cardboard- and other models from scratch is, that it is VERY difficult to get the hull exact right, without the tears of frames, together with the actual GA plans.
I have already thought of buying a sheet of paper-model, and from that, build one from scratch, so you have the diameter measures too. Never done it, though.
Perhaps, anyone experiences ?