Cabinet

The porcelain is just a thin layer over steel. To my mind the question also arises, will the components being surrounded by a steel encloser, except the front when the door is either open or removed, present any problem. I don't have any knowledgeable opinion but someone else probably does.

Oops. Double tapped the post your response.

Porcelain (ceramics), are regularly used in all kinds of electronics. Its a very good insulator. Tube sockets, cables, speakers, diodes, resistors, electrical outlets, etc. If anything, it might be beneficial. 

Just some general info.

" List of Common Insulating Materials. Clay (ceramic)(porcelain) - This is the standard material for high voltage and RF insulators. ... It is a good thermal conductor while being an insulator. Sheet mica is easily stamped and shaped forelectrical components."

It insulates current, not vibration. Thats pretty clear cut. 

Personally I think its the wrong type of environment to be housing audio components. Refinish it and put your beer in it $0.02

Thanks to all who replied!
With a lil labor, the doors have raised panels that I will be replacing with speaker grill cloth, & install a fan in the top rear of the unit. My existing unit doesn't go with my decor. I figured this will be strong enough to house 2-amps, 1-pre, 1-Pioneer sx1280 & miscellaneous gear. Total about 300 lbs. plus.