... It looks like all the LOWER/floor cabinet doors had originally been secured by a plastic hinged material ... Frankly I would rather NOT install all 'real' hinges that low. ...
What is a 'real' hinge?
My Overlander, according to InlandRV's site, uses the same door latches. So I assume the doors are similar.
But, my Airstream has metal hinges on all the doors.
I noticed you have a photo gallery. Please post a picture of the plastic hinged material.
I had considered piano hing, but (9) would be a chunk out of the pocket book. My doors still had the plastic edge. So I pulled out the stapels cleaned up the inside where it use to be hinged. I bought small one inch hinges put one on each end and one in the middle. Then took my plastic stip cut out the inside of the stip where the one inch hinge fit and slid the plastic strip back into place. Stapled the plastic strip on the inside. This covers up the raw edge that is exposed when the door is closed.
I was lucky I had all the origional plastic stips the P/O had threw them away. The PO did staple orange webbing over them when the plastic hinge broke. Sure was red neck looking.