havin been to this site b4 my only concern would be the placement of the field as it's a woodland site and has a lot of trees(obviously) but also stumps and other considerations when erecting a sup-air field.
if you level it all out and deduct the stumps and it's a decent field then i don't think you'll have any probs gettin people to train.
The reason that the amount of people that are interested matters is because if only two people ever turn up then it obviously would not be viable. But seeing as the response has been good i have been making queries for the air field and paint etc so hopefully if all goes well we will be able to get one up in the area.