wierd question.. need help creating virbation resistant stand for a "whole body" vibration 1

[foxfitnessrepair]

first off I dont like the idea of the machine nor do I believe it works but I have been recruited to create something to dampen the vibration. Here are the specs, and max user weight 250lbs
Model: EOS 6600
Commercial Vibration type: Oscillating (seesaw)
Amplitude: 0-10 mm
Color: Silver / Gray
Time setting: 1 minute to 60 minutes / Increments of 1 minute
Speed: 1 Hz to 40Hz / Increments of 1 Hz
Mode: Digital / Analog / Auto
Pre Set Programs: 1-Stand Straight / 2-Knee bent / 3-Push up
Control Panel: Digital display / LED Lights
Load Capacity: Max: 450 Lbs.
Power: 1.5 HP / 120 Volt 60 Hz
Dimensions: Platform: 9” W x 24” L
Assembled: 30” W x 38” L x 52” H
Weight: Net: 160 Lbs. / Gross: 195 Lbs.

Here is what im thinking, not exact and havent done calculations yet but my worries are balance of machine when user steps on it. and height the "plate" will have to be off the floor for total weight of about 450lbs (machine and user total)
Ive attatched rough idea

 

[foxfitnessrepair]

With all of the insight I got from you guys I will go with my first assumption as to not continue trying to solve a problem that should have been thought of in the first place. For the price and especially how much it actually vibrates its been out of my ball park from the get go. I can fix problems but creating and designing has proven to be all of your fields. Thank you for the help and i sure I will be on again with another inquiry but on this I have haulted future ideas. I didnt even relaize he was charging so much (scam) in my opinion. Dont even want to put my name on it!