Considering the age and mileage its not wise to spend money on this model, as its parts are expensive and no matter how cheap you are buying you will spend VERY GOOD fortune on spare parts in less than a year with this high mileage.
Answering your specific questions:
It's just ok in the desert, nothing wow or even good. If it's SWB 3.0 then its good. LWB 3.0 is barely enough for sand, but wadi drive should be fine. Basically, it's underpowered for real offroad use.
Not really, except bumper scoop.
With 3.0 LWB, you wont be able to climb so high to scoop tbh, but yes there are easy ways to fix this scoop issue in less than 300-400 dhs.
Not worth spending money on this, as you won't keep this car for long - for sure. Just learn and move on (at max).