I used to grow about a 250 ft row of winter squash every year. No way can I remember all the details you ask for,but rows on each side were 5 ft away and they were never taken over by Kikuza.
Several decades ago it wasn't easy to find seeds for it and I remember I got seeds from some place in I think Oregon,can't remember the name.And there are two Japanese compnaies on the W coast that also sell seeds,last I knew. Maybe their names are in the link below,I didn't check.
All to say that it was always one of my favorite squashes and I'd grow it every year. Not as good for storing as many other ones I grew,but who cares.
https://www.google.com/search?q=kiku..._AUIBygA&dpr=1
Carolyn