Rudy, Also if you have a FCS you can do the same way by replacing DMRGateway to YSFGateway.
Bridging XLX I only use one instance of MB but I point to YSF reflector looks like this: First instance: XLX<->BM<->YSF this is very efficient
To bridge BM -TG I also use one instance of MB and also point to YSF reflector. Second instance: BM-TG<->MB<->YSF
This is not a chain both instances run independently in one box. The downside is if you dont have YSF reflector then you go back to square one : ( 73, Eric