Of course he will make the hourly rate, its just go to be staffed correctly. no school is going to pay 50 per hour per man, but if you've a few men working on it then he wont need to charge that much cos he's making a decent mark up from the staff.
using the example of 200 a day per man (just an example), thats 800
200 for each man and paying 120 to 3 staff, thats 80 each from 3 men, he earns 440 for the days work.
Alternatively, stick 4 men on it at 120 and earn 320 on top of the houses he would normally do. just depends on the involvement he wants.