PPS has a long way to go to qualify for upgrade to nasdaq and short of a buyback, which would be very costly, it's hard to see how else they can move the pps up without a R/S.
To be honest I think they should focus on other things more important than upgrading to the Nasdaq at this time.
They are months away for from producing anything at LaCosta plant and they have 2 LOI's that are probably going to be time consuming and expensive to deal with why throw an exchange upgrade into the mix now.