Hello, My son has got hold of some Kef B139's (in excellent condition) which he wants me to build TL cabinets for. Construction skills aren't a problem, and I intend to follow a Rogers Monitor design ( if anyone has a modern interperetation of this design I would be grateful-Reno maybe? ) My lack of knowledge is the matching of mid range and tweeters and crossover. Any suggestions within a tight budget -he doesn't get much pocket money! He has a pair of Leak Sandwich 300's with broken mid/bass drivers, would the tweeters and crossover be of any use to the project?