I would say thats more than plenty of venting! the holes in the bottom are probably the important ones as gas vapour is heavier than air.
Theres no source of ignition in there is there? such as battery, or other electrics? I think its never a good idea to put electrics and fuel in close proximity if its avoidable. If you were thinking of putting a battery in the partitioned section i would be inclined not to and just use it as a general hidey hole ,
I am usually not as green as i am cabbage looking.