320-480w 10-14 strips. (Leaning towards bluer spectrums. Again for node spacing) I’d fix the rear end where you have about 3.5ft height. Your propagator won’t need full light anyway so you can tuck that a little further back should you need to. And then you can still have the 2 rope ratchets at the front if you need that little bit more height/time.
Really won’t work out that expensive your end