PTG make floor plates for the Mod 70.
Not sure about a detach mag conversion for the 70 though..
Midway price for the Cdi is 284 plus shipping which will be a tenner...
Compare that to a Rem 700 bottom metal conversion from say Third Eye Tactical at 180 plus shipping and your obviously paying another hundred quid before you add the AICS mag.
Having said that, the Cdi Precision gear is good quality, you have a (dare I say) not as popular rifle brand (in the UK) anyway, so will pay over the odds for any aftermarket add ons..
You've got to ask yourself if its worth the extra cash...