Also, while it will benefit stabilisation, will putting some bricks on the bottom level of the stand compromise the idea of a 'light' stand?
well, if your stand doesn't touch floor through the carpet (via spikes) then your whole project is for nothing.
If I put the isonodes underneath my CD player on the lowest shelf or amplifier on the middle shelf will it affect the turntable at all? Is there any point isolation your amplifier as it has no moving parts?
which component on which level in your stand? top heavy things wobble! heavy things should be close to the floor as to keep the center of gravity low. if i may be presumptuous; you are probably wanting to keep the lead from your tt as short as possible, so put the cd on top of a granit plate on the bottom shelf killing 2 birds with one stone. better would be to have a dedicated stand just for your turntable.
amplifiers need isolation too, even without moving parts or tubes. look at all the money, material and research put into an amp to damp the prints and transformers.
just try out the different ways to isolate unit, spikes or isonodes or whatever else you may find. there are a lot of finished tables you can buy for a linn. it seems that multiple bases supported by cones work best. also the cones should line-up one on top of the other.
hope this all helps.