Packing of Random variables into List of bytes

Example:

// class -1
  class fc_field;
   
    rand bit [1:0] protocol_ver;
      constraint pro_ver {
          protocol_ver == 0;
      }
 
    rand bit [1:0] pkt_type;
      constraint Pkt_type {
          pkt_type == 2;
      }
 
    rand bit [3:0] pkt_sub_type;
      constraint Pkt_sub_type {
          pkt_sub_type == 11;
      }
 
    rand bit to_ds;
      constraint To_ds {
          to_ds == 0;
      }
 
    rand bit from_ds;
      constraint From_ds {
          from_ds == 0;
      }
 
    rand bit more_fragment;
      constraint More_fragment {
          more_fragment == 0;
      }
 
    rand bit retry;
      constraint Retry {
          retry == 1;
      }
 
    rand bit pwr_mgmt;
      constraint Pwr_mgmt {
          pwr_mgmt == 0;
      }
 
    rand bit more_data;
      constraint More_data {
          more_data == 0;
      }
 
    rand bit protected_frame;
      constraint Protected_frame {
          protected_frame == 1;
      }
 
    rand bit order;
      constraint Order {
          order == 1;
      }
 
  endclass
 
// Class-2

  class seq_control_field;
   
    rand bit [3:0] fragment_number;
      constraint Fragment_number {
          fragment_number == 0;
      }

    rand bit [11:0] sequence_number;
      constraint Sequence_number {
          sequence_number == 0;
      }

  endclass   

// Main Class. This instantiates the fc_field and seq_control_field class objects

  class mac_header;
   
    rand fc_field fc_obj = new();       // Object of fc_field
   
    rand bit [15:0] duration_id;
      constraint Duration_id {
          duration_id == 0;
      }

    rand bit [47:0] address_1;
      constraint Address_1 {
          address_1 == 48'h001122334455;
      }

    rand bit [47:0] address_2;
      constraint Address_2 {
          address_2 == 48'h009988776655;
      }

    rand bit [47:0] address_3;

    rand seq_control_field seq_obj = new();      // Object of fc_field

    rand bit [47:0] address_4;

    rand bit [15:0] qos;
      constraint Qos {
          qos == 16'h0000;
      }

  endclass   

In the above example, how can i pack the mac_header into list of bytes? This shouldn't affect the constraints on the class member functions, of all the threee different classes.

Also, is there any way to print the class object?

All of the above can be done eeasily in specman, is it possible in the systemverilog implicitly?

-Vivek Prasad