So i have created my levels of detail at 500, 2500 and 5000, which can be seen in the two videos below. the first is wire framed and the second without.
To do these i started with the high res mesh i made, and constructed a low poly cage around it which ended up being my low res model. as this didnt really have the topology i wanted for the higher modles i started again on the medium and high using similar topology to a poly sphere.
I liked doing these, it feels nice working with constraints and this has shown me futher that I like the subject of 3d modelling.