Have you got a photo for that instalation.Others will ask
Chester, sorry I am not good with photos---yet.
Pehaps this will help:
Go to Lowes and buy aluminum angle iron. A 4 foot piece costs about $4-$5. You can select whatever size angle iron you choose, but I got a piece that is 1" on each side.
Measure the width of your door frame and cut the angle iron to that length.
Predrill some holes (about 3-5)) in the alum. angle iron and in the aluminum edge/overhang on the door frame directly above the door. (You do this by drilling holes in the angle iron, then placing it on top of the door frame with the blunt side outward, then drilling through those holes to make holes in the door frame ledge underneath. )
Please a bead of silicone or similar substance on the door frame overhang.
Place the alum. angle iron on this overhang with the blunt side facing outwards. I used 1/2" self tapping screws to bond the 2 pieces together. You might also want to place a little silicone on top of the screw heads to prevent rusting.
That's all there is to it. Water will drain down the roof to the top of the door frame, get trapped behind the angle iron, and then drain off each side of the door.
I rounded each end of the angle iron for appearance sake but that is not necessary. Everyone who sees this modification says it should have been there in the first place.
The only thing the least bit tricky is to measure carefully where to drill the holes. You can do this by getting on a step ladder and looking closely where holes should go when you hold the angle iron to the door frame ledge. (You'll figure it out.)
Further note: at the bottom of the door frame my Casita had only one drain hole. I made 4 extra ones.
I've considered using the rest of the angle iron to form shields over the water tank/storage compartment and over the water heater/electrical cord area. Haven't done that yet but have considered using something like Liquid Nails to bond the flat side fo the angle iron directly to the fiberglass so that a small ledge is formed. I've already rounded the ends of my extra pieces so that they will not snag clothing if I decide to install them.
Hope this helps