Okay instead of redesigning everything I will go with your idea.
One do not use 1/2 EMT conduit to span 10 feet use at least 3/4 EMT.
You might as well make it all 3/4.
What the heck you are only going to use 3 sticks so go one inch.
Use the 2 inch PVC in the buckets not the 1 1/2.
Now you need to clean the PVC Pipe with a solvent to remove the oils from manufacturing and paint it with a paint made for plastic.
You need to do the same with the buckets too.
This will stop the UV light from breaking them down.
Next how to attach the conduit to the PVC there are a few options.
Option number one.
Drill holes in the PVC so the conduit will slip through.
Option number two.
Learn how to lash PVC and conduit together with twine.
Option three.
Find fittings the will allow you to connect the conduit to the PVC pipe.
The nominal outside diamiter of 3/4 EMT conduit is 0.922.
This option will raise the price up too much due to having to find all of the fittings that would work.
The EMT conduit you can get fittings for pretty cheap.
Use 2 of these to connect the 5 foot EMT to the 10 foot EMT.
http://www.homedepot.com/p/Halex-3-4...4407/100111131
Use 1 of these to connect the 2 sticks of 10 foot EMT.
http://www.homedepot.com/p/Halex-3-4...6282/202288508
Worth