Yes, just go for it. I did exactly that on a really heavy clay weed infested paddock last year, basically following the methods expounded in this website with 6inches manure/compost on the beds and 2 inches over cardboard for the paths (using beds without wooden sides) and everything worked out just fine. Never had such good crops. In fact the biggest problem I have had all year was getting the pasnips out without breaking them off too high up!
Best of luck!
Derek