Grape Growing Trellis

grape growing in the raised bed?
I have a long, one foot raised bed large garden and nine inches deep (can be deeper it is only filled in the soil blackdirt existing) has a trellis behind it and I would like to plant a vineyard or two there, but I do not know if Catawba width / Deep enough. Also, if I can plant there, what is the best way to make better soil drainage? Should I dig under and to break into the old soil and add lots of peat moss in the ground? How deep should I go? Thanks in advance!
You can try here for more help. http://howtogrowgrapes.net/
Grape Trellis Systems