First of all, thank you all very much for your input.
The trunk is actually a newly manufactured replica of an old steamer's trunk. It has only a metal latch that would rattle. This can be handled OK. The metal straps and other parts are screwed down already. The client is aware that the trunk will be modified. They are not critical listeners and are more concerned about esthetics here than some minimal degradation in sound quality. One comment suggested that the subwoofer should not sit on the floor, but rather should be mounted inside the trunk, strattling the hole in the bottom. Any other opinions on this? I thought the hole in the trunk bottom should be large enough to allow the subwoofer to sit on the floor. Also, a vent hole can be cut in the back of the cabinet to allow for heat ventilation. Any suggestions on a good, powered downfiring subwoofer under $1000.00?

Terry