No more to wait, here it is ! Simple to use (5V only), two signal pulses to switch the HV pulser on and off, two SMAs for connecting to the transducer, and to the analog processing, and a pin to route the signal through a stripboard to the analog processing unit.

The modules, once assembled, look great =)

And the signal is clean as well, getting a good echo with an ATL3 :

Reading more on https://github.com/kelu124/echomods