Condition and how well its been cared for is more important than milage. Check the chassis and bulkhead thoroughly for rust. The mechanicals are cheap enough
Get some new nyloc nuts (i would have thought be pretty easy to get hold of through a local fastener supplier) unless you can drill a hole to put a pin through?
Compared to its competitors it is good off road. Compared to off roaders it has its merits and drawbacks. If you want an offroader buy a defender. If you want an offroader that is family friendly and still capable buy a disco. If you want a car with 4wd that can tackle more than the average car...
1k over 5 years? My ford puma cost me that in 2 years with one thing or another..... admittedly a lot of it welding, and new belts and a waterpump. Might keep the micra, low mileage but battered, and buy a cheaper rr as a pride and joy toy