Hi Gunny
Without wishing to 'rock the boat' hoho, there are a couple of points in your last post I have to query mate...
1.  
"Patrol Torpedo Boat (PT-Boat), a small, fast vessel used by the United States Navy and the German Kriegsmarine "The Royal Navy ran one or two of them as well I seem to recall!
2.  You're right to direct people to the GLS site, he does some fantastic upgrade sets.  However do please note that for MTB/MGBs etc so far it is mostly weapons sets on release, rather than complete kits (for example I know David Parkins is planning full kits for the MGB, MTB and HDML, amongst others, but they are not yet for sale 

 )
Can't wait until they are mind you - the wallet will take a right hammering when that happens!
Finally, many MGBs and MTBs in RN service switched roles from one to the other, with several MGBs at least later being fitted with torpedoes.  Perhaps in view of this you could flex the campaign rules a little to permit MGBs and fast rescue launches as well?  Similar hulls were after all common to the different types/roles...  Up to you of course though mate, you're the campaign leader!
As an aside, I've been reading up a bit on these lately (and hope to review some of the books soon), and it seems that the preferred RN tactic was for the MTBs to lie in wait for targets on auxiliary engines.  When a coastal convoy came into range they would crash-start the main engines (doing so any earlier would warn the enemy through the horrendous noise the engines put out), run in to attack, and then withdraw at speed to meet up with a covering force of MTBs.  All this at 30-40 knots, more often than not at night.  Exhilirating, and I dare say scary stuff!