I think a manual is always a must. No matter how much experience you have building models, you need, as Peter said, some reference points. Each model is made different, so, a guideline for the specific model is very useful. I got an Impact and it helped me a lot the good manual provided by Carf, It has many pictures and a picture says more than a thousand of words. There are particular points inherent to each model that the manufacturer should point out in a manual in order to achieve the best results when assembling the model. I hope Camodel will come up soon with a nice manual for the Osmose, I guess the Osmose will be a good seller. Do not forget that CPLR is not the manufacturer, he is only the designer !.
Enrique