RCG user "quadmovr" shows off his M4:
http://www.rcgroups.com/forums/member.php?u=534985
A lot of nice pics there - and a nice build, too!
There`s also a good tutorial how to strip a Graupner GR12 receiver to fit the M4:
http://www.rcgroups.com/forums/showthread.php?t=2225448
@ Menno: where do we solder the GR Telemetry wire on the M4? Would be nice to have!
Will ask him if we can use the stuff for our Wiki.