I think if I was going to plant many I would get and old three pt hitch corn planter. Put hill drop plates in it or make your own. . That way it will drop three or four seeds per turn . Every ten foot pick it up and drop it down leave it down for a foot and pick it back up. Either mark it out ahead of time or mark the wheel. Could also buy a measuring wheel to put on planter. Get real handy put a heavier wheel with a gear that only kicks on every ten foot.The possibilities are endless. Start making them and selling them to other pumpkin growers.. There are many out there doing it by hand.