I've thought about making a diy dust cover before, but then decided frequent dusting with a soft paint brush does the job quite well. If you're the type that does a fairly thorough weekly house cleaning, with the added dusting of stereo equipment, it's not so bad really with the dust issue.  

You'd need to have a cover that has built in fans with a filter on the intake to stop dust etc.. There definitely would be a lot of heat build up using a tube amp under a cover, so good airflow would be paramount.. Also anytime you wanted to change the volume or turn on amps/preamps etc that are not remotely controlled, you'd have the hassle of removing a cover each time..

Could be a fun project though as long as you have lots and lots of quiet and filtered ventilation, and also use a non flammable cover such as glass.

Oh okay, if you just wanted to have a cover for when it's not in use that's much easier for sure.. Probably you'd just need to set a timer at first to see how long it takes everything to cool down to warm etc, then add the cover.. Once you have found out the minimum time it takes to cool down, you could then set your timer for that amount of time to remind you to put the cover back over the amp.

I guess with the fan idea it would probably need to be ducted to have the fan or fans well away.. So probably one side of the glass box cover would have filtered intake vents, and the other would have a fan pulling a high volume of air through a duct well away.. Dunno, probably wouldn't look too great lol, and it's much easier to just dust regularly.. Plus the Decware amps have the added bonus of being dust proof on the insides, so a quick hit with a paint brush on all the outside visual area's seems the easiest way (to me) to keep em clean and pretty  

I like the idea though of having a cover to put over everything when not in use though. Sort of like an extra measure to treat the gear special etc.. Here I get a fair amount of dust from using a wood stove daily for heat, which creates a fair amount of mess and dust etc. Still I can keep up though, and if you find a decent soft bristle paint brush it really works well to keep the amp(s) and other components clean.

The paint brush method works really well for cleaning down into the fins of sub amps also, and around dials and such etc.

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Or, try an old fashion feather duster.  I was amazed at how well one worked.

Blueone, that's the ticket.

Yeah, it does the trick.  I notched out one inch in and two inches high across the back to allow for the power, component and speaker cables.  I have several speaker wires I've tried in the last six months, some thicker than others.  If I had it to do over I would notch out all the way across to better accommodate the thicker stuff.  And, when not in use it dresses the amp up a bit.

Pricewise... Ouch!  The ones they are building look very much like mine.  I checked and I paid about $120.00 via JMKdisplays  I'm getting ready to have them build me another for my office amp.