Mold building advice needed

[Eugene]

I need someone with more experience to tell me what to do again. I need to know how mold supposed to look like at the spinner. Should I build vertical plywood wall, like I did upfront? Or should I continue level, almost like going into the spinner? Can this be done both ways? What is the pros and cons? Thanks in advance!

 

[stanislavz]

 

[wsimpso1]

 

[BJC]