Roger, it's almost impossible to guess at build time for any individual builder. It's more about individual standards of finish and time spent wondering "how will I do this" tasks. Yes, I believe an SL-C could be done in 200 hours. That is if you have everything on hand, don't paint the car, use a stock engine and unmodified gearbox, spartan interior, etc. Also depends upon how long you simply sit and stare at in in the shop!
I have more than than in going off on tangents (earlier posts). A few details and my second assembly begins. But, that's how I am.