quite surprising this one the first hurdle is your rates issue once the council find out especially when you are hiring it out
there are a lot of contractors out there and as you say such a variance in costs the cheap ones have they got insurance have they done this before are they prepared to take you to previous happy customers
i would shy away from getting every man and his dog in to do the work a bit at a time
also the cost they are not cheap
if you goggle greenwells arenas (Brian harper) and contact them they might travel to your area there is only one way to do an arena and that is the correct way
i fail to see the point of digging down to build it back up again
type of machine that is down to the one supplying it a 3c and mini diggers are just farting about costing you money but making money for them Brian uses a 13 ton excavator far quicker and better at the end of the day it is your money spend it wisely