Welcome to the site.
I sank my first condos last weekend. I used both PVC and some scrap wood i had around the house. From what I have been studying from the guys on here is that just about anything goes for artificial structure so long as it is not toxic. I am looking forward to not getting hung up on the PVC though.
DP
I am a heterosexual male. 2 Chronicles 7:14
"If my people who are called by My name will humble themselves and pray and seek My face and turn from their wicked ways, then I will hear from Heaven and will forgive their sin and heal their land."