What series VT motor is it,if its series 1 then dont bother buying it,thats why the rear main seal is leaking the VT motor was renowned for the rear seals leaking.And it also depends on how long it has been leaking because once the main seal goes the motor will need to be fully reconditioned.And trying to get a blue slip,the mechanic will try to find everything thats wrong with it.It sounds like the actual car has done plenty of kms,if its got 200ks on it now then what do you think the original vs motor had on it?You probably wont be able to insure it for what its worth.I have VS Berlina,I have spent about 10 grand on it but its only worth 3 grand according to the insurance company.Your better off buying one thats already got every thing that you want on it,because you will be off in the long run.