Other than the esc being in a funny location, thats an awesome build
I would run a mounting plate across above the motor, and mount the esc on that so it sits lower, or maybe something over the lipos on a plate, just doesnt seem safe where it is now, even with a roll bar and fibreglass shell.
With your ornage sheeving ( nice stuff ), I would put some extra heatshrink tubing over the ends & the bullets again, just to tidy up the ends and prevent fraying.
Where abouts you from exactly ( in the UK I take it )?