I just did about the same job this week. Will be complete by noon tommorow. I have 28 hours in it using a D39 Komatsu. There was a little rock involved that slowed the process. I told the owner 3600$ , he was happy and from what I am seeing I will be getting little over 100$ an hour for that tractor. I run it for 85$ but like you the guy wanted a firm price. So both parties are happy in the end. Actually should be about 112.50 per hour. I feel you can do the same with that 5G. The only thing about the hoe is less compaction . Every pass with the dozer will give you a bit of compaction or take the hoe and wipe it down real well. We have heavy clay as in push the blade down raise up the front of the tractor to get a cut started. Then take about 6" a pass. I'll photo my job tommorow. My job is round does yours have to be square?