I know this is an oooold thread but..
ESU has 2 new/newish pruducts that may help in SHS switchers. It may well fit alot better.
First is a slightly smaller speaker. The ESU 50345.
It is 22mm x 42mm x 8.0mm, the Tang Band is 24mm x 55mm x 8.6mm.
A new decoder is the LokSound 5 Nano DCC. ESU 58923.
It is slightly smaller that the Micro and comes with a wiring board.
TC Carr