Hi,
So you are saying its 860 blocks square or 860 north and 860 south therefore like 1.7k across. If so this would be unworkable for world edit as this would be in the region of $12,000. If its the smaller area it would be $3,000.
Even if we did heavly discount this it would still be extremly expensive and we would like you to keep your money for yourself and not spending it to clear blocks in a game. This world edit request as it stands will not be workable for us or yourself.
If you have further information to include about it, this can be look at if you are wanting to go down this path with wanting to world edit it away.