Converting-a-WL6-indicator-to-WL7-with-a-parameter-double-array

I have a WL6 indicator I'm trying to convert to WL7. The first problem is that a double[] parameter array is passed into the main constructor. I'm not even sure how to define that in WL7. But this parameter array typically takes a default, so I decided to use that default for the Populate() version of the indicator like this.

CODE:

public RankThres(TimeSeries ds4Thresholding, double centerRank) : this(ds4Thresholding, centerRank, defaultBeaconPeakReboundRange)

But that calls the main constructor which isn't properly initialized by ": base(parameters)" like it is in WL6. Instead, WL7 simply uses ": base()" instead, which doesn't initialize anything. So this workaround fails.

So how do I get the optional double[] array parameter into this indicator? Below is my workaround which fails. Maybe you can fix it; otherwise, perhaps this WL6 indicator isn't convertible to WL7 as an indicator.

CODE:
namespace WealthLab.Indicators
{
   public class RankThres : IndicatorBase  //Threshold determining indicator via peak Rank, RankThres
   {
      private static readonly double[] defaultBeaconPeakReboundRange = { 0.12, 0.6 }; //default lower&upper minimum rebound limit for beacon peak detection
      private enum BeaconPeakReboundRangeLimit { min, max };

      public RankThres() : base() { }

      public RankThres(TimeSeries ds4Thresholding, TimeSeries dsTimingBeacon, double centerRank, double[] beaconPeakReboundRange, double outlierToleranceMax = 0.11) : base()
      {
         //Main code in here.
      }

      public RankThres(TimeSeries ds4Thresholding, TimeSeries dsTimingBeacon, double centerRank, double outlierToleranceMax = 0.11) : this(ds4Thresholding, dsTimingBeacon, centerRank, defaultBeaconPeakReboundRange, outlierToleranceMax)
      //public RankThres(TimeSeries ds4Thresholding, TimeSeries dsTimingBeacon, double centerRank, out double peakReboundMinOut, string description, double outlierToleranceMax = 0.11) : this(ds4Thresholding, dsTimingBeacon, centerRank, defaultBeaconPeakReboundRange, out peakReboundMinOut, description, outlierToleranceMax) { }
      {
         Parameters[0].Value = ds4Thresholding;
         Parameters[1].Value = dsTimingBeacon;
         Parameters[2].Value = centerRank;
         Parameters[3].Value = outlierToleranceMax;
         Populate();
      }

      public override void Populate()
      {
         TimeSeries ds4Thresholding = Parameters[0].AsTimeSeries;
         TimeSeries dsTimingBeacon = Parameters[1].AsTimeSeries;
         double centerRank = Parameters[2].AsDouble;
         double outlierToleranceMax = Parameters[3].AsDouble;
         DateTimes = ds4Thresholding.DateTimes;
      }
   }
}