christmas decoration frames

[tybo562]

I want to build some Christmas decoration frames.  I have used corrugated plastic sheets on some of my Halloween displays this year and they seemed to work good for the small pumpkins that I made.  I wanted to make a large Snowman and Santa.  Is this the best material to use.  I live in Washington where it rains a lot this time of year.  I am worried about the longevity of using the corrugated plastic in the rain.  This seems easier to use where I can just drill holes and insert lights rather then welding metal frames together and attaching lights.  I can weld but bending the metal is the hard part.

 

Any suggestions would be helpful.  I plan on making large displays over the next few years and don't want to have to do everything over and over again every other year.