As others have mentioned, while you can "get by" without having rear movements, you essentially lose the ability to control perspective. If you want verticals (e.g. trees and/or buidling edges) to be parallel, the camera must be set up so the back is plumb. Thus, vertical compositional adjustments can only be made via rise/fall of the front standard. Alternatively, the fixed-back field camera can be used in a manner similar to a 35mm, where perspective controls just aren't considered. Very limiting for a large-format camera.
For better flexibility of technique, one of the other Toyo models (or a different brand that offers all conventional movements, even if limited) might be a better choice. I use a (metal) Toyo 45AX in the field, which is the same as the 45AII, except that the back rotation is "manual". These can be found on the used market at about the same price, or lower, as a new Shen Hao.