Implementing OMP

Rutgers University Libraries are long time users of OJS. We have not upgraded to either OJS2 or OJS3. We are interested in pursuing an OMP implementation for open/affordable textbook publishing. We have spoken to a number of colleagues who are publishing e-textbooks, but none of them are using OMP. We would like to speak to a library that has implemented OMP as an e-textbook platform. Is anyone on this forum doing this?