If I had the skills to do this, I would ask for a co-host payment of, say, 20% for the first year, 10% after that ongoing to maintain it all. Then the host can see you are incentivised enough to do the ongoing work.
Otherwise it's <enter your own amount> day-rate for doing the work and then walking away.
Putting a deck in, over here in the UK would cost £100 to £150 per day labour per man, plus materials. !0x10 deck half a day, plus another half a day prep and running about. One man job = one day's man hours.
Over here £100/day would apparently put me on the average national wage.
Just my thoughts.