Batteries and Watertank

We now have now set a date for our trip around Europe and we depart for Norway very soon and I haven't fitted a watertank, sink or secured the batteries properly yet. :o(

My intention is to mount a fiamma water tank and the two optima batteries under the rear part of the bed. I obtained a sheet of 15mm ply and I mounted the tank to this using the supplied fitting kit.

I then attached some battens to the ply to hold the batteries in position and secured some cheap straps to hold the batteries to the board. I then connected the batteries together and connected all the wires for my appliance circuits to my fuse box. The wires were neatened up with tie wraps and the main feed was connected from the batteries to the audio type junction box. I inserted the fuses and tested all my electrical items and they all worked correctly.