If you tune your Model A to specks you will be able to hand crank it without a problem. A six volt battery will be more than sufficient to start the vehicle and operate the accessories. Tube shocks are from a different time period. In my opinion it is like putting your grandmother in a bikini, it is just not right. The originals shocks will give you a good ride. There are many people on this site and books written that will enable you to keep your vehicle road worthy if left as close as possible to the way Henry designed it. In many cases a customized job can only be repaired by the guy who designed it. I started this hobby with little knowledge about the Model A. For historical reasons I kept my A’s original. On hind sight, I believe this was a good decision. My Model A’s can be driven anywhere and under any road conditions. And if one of them does act up, I just take it to a hotrod show and tell it, “this could be you, if you do not start behaving”, fixes it every time (actually I open Les Andrews book and am able to repair it). Whatever you decide to do, the Model A hobby is where it is at. These machines become an addiction. If left simple it will be dependable and easily fixed. JMO
Have many hours of fun,
Paul