What do you mean by evaporation walls? I was going to cut some holes in the top with remmovable covers to let the warm air rise out and the misters would also be on the ceiling. I would most likely have the cheapest fans so probably multiple fans set up in the corners of the greenhouse.
Evap walls is something we use in our green house. Its essentially a cardboard radiator and a fan and it pulls air through the radiator, it evaporates and cools.
I can tell you that today was the first warm day of the year in our green house, it was 72 degrees out and the evap system came on at 11 AM...
It was still probably 85 in there with the system running.
Without it it would be 100 degrees, at 72 degrees outside.
The problem with just fans and ventilation is if the outside is 100 degrees then the inside isn't going to be any cooler no matter how much ventilation you have.
Just misting won't work because then you'll over water everything.
Some tropicals will be fine with it, others will get mold and rot and die.
Misting and ventilation work well together, but it will still get very hot.