Well, there's a number of websites that supply free plans for download. They are always interested in new contributions. And update of an old plan to correct some of the pencil wobbles and with a modified structure to make it more suitable for electric power would certainly qualify.
The plans may not have shown any special consideration for throttle linkages but even back in 1964 the model would most certainly have used throttles.
Part of the problem with the plans you are working from could be that your paper has shrunk and changed over the years. It doesn't take a dunking in water for that to happen either. Even strong humidity changes can alter some of the cheaper papers over time and produce significant distortion. Or there may simply have been some slippage between the master and the blackline paper when the plans were printed.