This could be described as a relatively easy installation
Remove the tender, this is secured by three  clips located along both sides of the tender floor. The best method is to insert a single edge blade in the gap between the shell and floor and lever open the tender from both sides.
One removed to disconnect the plug to the rear marker lights and place the shell to one side
The installation required the addition of an 8 pin plug wired the NMRA standards and trimming the loom to about 30 mm long.
Do not cut the yellow-green wire of the purple speaker wires.
Next, remove the factory speaker mount and trim off all the lugs.
Dress the underside if the factory supplied board and fix to the tender floor using a cardboard insulator and contact cement - this is outlined in the instructions for the Wombat 30T.
Install to the image below, the speaker is fixed at the rear using contact cement leaving enough room for the Lasic small stay alive. This as also secured with a drop of contact cement thought blue tack would work
The decoder is installed on its side in a bed of blue tack.
Soundtraxx TSU1000 Tusanimi 2 custom programmed by MRRC
MRRC Micro Boost Large
Lasic Small Stay Alive