so what method is better the top or bottom curve (soz for my stupidity but i need to learn this)

i know wen i was placing them it was a pain cos they were really hard to match in all veiw port - i will look into the tangency tools ect

ill probly rebiuld them i dont mind if its gonna be better to look at an means future models will be better - also since i made those in ep should weni remake i use cv? (i am looking into basic tuts for nurbs at the mo)

but i still dont understand how u can get accuracy to 0.001cm with this as placing the curves is still inaccurate ont top of the blue prints

thx