Barnard PCP Questions (2019)

I’m a junior applying to two of barnard’s 2019 summer pcps and I have a few questions about the process and the experience (all coming from a first gen):
Barnard’s website gently suggests that your second letter or rec be from someone that isn’t a teacher… would it be alright if I still used two teacher rec letters since I’m 100% sure they would highlight what I want the admissions officers to see?
What are the benefits of this program? Will I actually have opportunities to network and get my foot in the door?
Is admission binding?
Does anyone know the acceptance rate?
And most importantly, what are the amounts of scholarships money they give out? Tuition is hefty hahaha!