I've been considering the possibility of grafting a giant watermelon variety (such as Carolina Cross) onto a giant pumpkin/squash/gourd rootstock (such as Atlantic Giant pumpkin, Weeks NC Giant, Zucca gourd, or Kikinda Competition Strain Edible Gourd). Would that affect the size of the fruit, ease of growth, and productivity, at all? I understand grafting onto squash and gourds can affect some aspects of fruit, such as firmness, at least.
Anyway, I'm hoping this might result in unusually large fruit, or at least easier to grow fruit in less than ideal conditions.
'Ease of growth' probably needs further explanation. Basically, I mean, Might it make it easier to grow large fruits (not giant, per se) without special treatment? For instance, Zucca gourds don't require special treatment to grow large, but people who grow giant watermelons and pumpkins usually report all kinds of tricks employed to get them huge (not that Zucca gourds are that big, though).
From what I read, it sounds like a gourd might be better for a rootstock than C. maxima x C. moschata, if I want good quality fruit. I'm not sure about plain old C. maxima.