I would ask him to flip the door upside down and use the rope to pull it shut -- keep the pipe. This makes it so there is not a rope tied to the bottom of the ramp -- you dont really need a ramp as your coop sits so close to the ground.
I studied this just a few weeks ago. 5 drops, directly on the skin, on the back, between the wings. Don't worry if you end up with a few more drops than 5. My research lead me to believe that even 15 drops would not be harmful. Also, Eprinex does not require that you hold back the eggs...
Antibiotics are not to be played with. This sentance, "... look a little under the weather I'll give them a dose." is typical of folks who don't understand how antibiotics work, nor do they understand the dangers of using antibiotics when they are unnecessary.
Please don't use any antibiotic...
The faint smell of skunk on the air could very well be from an owl. Great Horned Owls prefer skunk over any other meal. They are immune to the smell, but will get sprayed at times during the take.
Eprinex will kill both internal and external parasites.
DE will not help with internal parasites. DE will also need to be applied frequently, while Eprinex is effective for at least 6 weeks.