Isolation question. Monitor on Subwoofer


Just curious...

I have 2 subs, and due to space limits i have been thinking about going with Monitors and putting them on the subwoofers.

Here is my idea, if anyone knows if this will not work please let me know why.

Subwoofer on spikes.
On top of subwoofer either a marble or granite slab. Felt beneath the slab to keep it from scratching the top of the sub.
Monitor speakers coupled on small custom built stands (possibly built to hold sand or leadshot) to achieve the correct height, spikes on the stand which would sit on the granite above the subwoofer

Would this achieve decent isolation between the monitor and subwoofer? I see alot of speakers with built in subwoofers, or other types of speakers with the fullrange box and monitor on top, (GMA Continuims, Watt/puppy, etc)

Thoughts on this from you Coupleing/Isolation Guru's?

Would this do a decent job of isolation or should i look into other methods?
slappy
Ship em to Rick. He can bring them and we can all compare together in August. Rick is going to move my whole system out onto the deck where Krissy and I will sip Pina colada watching the hummingbirds and relaxing while Rick sets everything up and compares springs, Pods, Podiums, speakers, cables, power cords, DACs, amps....caps, wire, direction of wire, cable elevators, rubber bands, Schumann generators.... circuit breaker panels, AC outlets, AC wire, wall board, sheet rock, carpet.... records, CDs, Hot Stampers, and streamers. If after all that Rick says the Sistrum is the bomb that is good enough for me.   

Oh, and in the interests of the OP we will even try all these different things on a rack and compare to how they sound on a sub. 
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