My thinking on the plywood/glass tanks is that they would inhibit a lot of light.
If you are thinking fully aquatic plants, like Vallisneria, Aponogeton, Cabomba, and similar, which must be grown submersed, glass tanks would be better to get more light at the plants.
Plants like swords, crypts, some stem plants, Java Fern, moss and Anubias to name a few are actually marsh or bog plants that nurseries cultivate emersed in damp soil and not submersed. So normal terrestrial nursery propogation trays would work. The greenhouse would presumably give the humidity. Nurseries use this method because it is less expensive, and much faster. Plants can assimilate CO2 directly from the air (if grown emersed) at four times the rate they can submersed, plus you don't need to be pumping CO2 into the air as you would with water.