gmorning

i'm wanting to make a new coffee table and would like to make a serpentine top.
i dont have cad drawing. im a bit perplexed as to how to make a full size drawing,
how to get the curve and return right. is there a ratio? im guessing to draw the bow
with a narrow strip and weights, but how to get the return curve right? is it just trial and error till
you get it right? any advice would be appreciated.

regards,
Eric