@@ 280,8 280,10 @@ class Assemblage::AssemblyBuilder
 				end
 
 				self.add_build_log "Executing %s" % [ script ]
-				cmd = TTY::Command.new
-				cmd.run( script )
+				cmd = TTY::Command.new( output: self.build_log, printer: :quiet, color: false )
+				result = cmd.run!( script )
+
+				break unless result.success?
 			end
 		end
 	end

          

@@ 1,6 1,7 @@ 
 # -*- ruby -*-
 # frozen_string_literal: true
 
+require 'pp'
 require 'socket'
 require 'assemblage/cli' unless defined?( Assemblage::CLI )
 require 'assemblage/assembly_builder'

          
@@ 42,7 43,7 @@ module Assemblage::CLI::SimulateCommand
 					revision: 'tip', # :TODO: Allow specification; auto-determine based on repo type?
 				}
 
-				builder = Assemblage::AssemblyBuilder.new( directory, assembly )
+				builder = Assemblage::AssemblyBuilder.new( directory, **assembly )
 				builder.start
 
 				stage = nil

          
@@ 59,8 60,12 @@ module Assemblage::CLI::SimulateCommand
 
 				res = builder.final_result
 				log = res.delete( :log )
+				res_pp = String.new
+				PP.pp( res, res_pp )
 
-				pp res
+				prompt.say( headline_string "Result Struct:" )
+				prompt.say( res_pp )
+				prompt.say( headline_string "Log" )
 				prompt.say( log )
 			end
 		end