hmm your picture doesn't appear to display anymore. but looking at your video it looks very similar to my set up

how did you mount the buttkicker? im using an mr2 seat and bolted a clark synthesis transducer to one of the cross members that the seat bolts too and then another one to the bottom of the seat itself using brackets.
I then used rubber between the seat mounts and the chassis, so that all the rumble would be kept within the seat and not lost through the chassis.
And then sat each of the the chassis legs on rubber just to make sure none was going in to the floor, seems to work well.
have you got a video of the chassis itself? you not thinking of sticking a PC in there too ?
should be uploading a video of mine by next week