Linn LP12 Cirkus baring

Ok I need some guidance. I got a Crikus baring and inner platter but no Sub chassis but I understand it can be fitted in the old sub chassis with the use of spacers. My question is how thick should the spacers be and where to put them? I can’t afford to get a sub chassis at this time. I can not find a definitive answer as to how to do this. I will get a third party sub chassis next year.

KOF