I am currently working on a Turbine based design, that is powered by TRINAMICs TOSV Ventilator control board. As a first step I am doing a prototype assembly (3D printed + Acrylic. Next step will be a mass produceable version. I use an ACARE Blower, a TOSV and a Raspi4 (only for user interface).
I have recently posted an open source reference design that supports spontaneous pressure triggered ventilation and pressure-limited mandatory ventilation which includes 3D printable parts, real time control firmware and Arduino control shield here: https://github.com/whpthomas/open_bvm_ventilator