Destruct-o-mizer Construction

This is the second version of a Destruct-o-mizer that I've made.  The first is similar, but uses a smaller box that does not have a fan.  I gave it to my former mentor teacher at another school.

The cover is removed from the printer box and set aside.  All hardware is kept for reassembly.  The fan is also removed temporarily.
The foam soundproofing is removed.  I removed as much as I could with a scraper, then used solvent on a rag to get the adhesive off.
I didn't bother removing the adhesive from the bottom of the box since it will be covered with whiteboard material.  The fan will be reinstalled after the whiteboard is in place.
Unfortunately, when I returned to finish the job, I didn't have my camera along.  But here's a description of other activity:
bulletCut wood strips (about 1" tall) and glue/screw into the bottom of the box.  This is to elevate a piece of whiteboard that will be the visible surface where the test clips, indicator light, current limiter, etc will be mounted. 
bulletInstall a momentary test switch recessed into the bottom right wall of the box.  I used a 'handy box' to house the industrial style momentary switch.
bulletCut to fit a piece of whiteboard.  Install test clips, test light, lid-down switch, and current limiter onto the whiteboard.
bulletMake all wiring connections from the whiteboard to the main box.  Route the wiring between the wood strips.  Screw down the whiteboard.  Put covers over the holes in the bottom and at the rear of the box.
bulletUse a dowel or other pushing rod to close the momentary lid-down switch only when the lid is fully closed.  Adjust the rod length as needed.

If you decide to build a Destruct-o-mizer, there can be many variations on this theme, and many ways to build one.  But I advise the following as minimum construction and operating tips:

bulletUse high electrical integrity.  Keep adequate clearances.  Have no exposed wiring outside of the test chamber.
bulletHave at least three switches in series that must be on to start a test.  For this box, there is a switch on the fan unit that feeds a receptacle, there is the lid-down switch, and there is the test switch.  Two of these switches are momentary.  In my first Destruct-o-mizer, there was no fan, so I used toggle (light) switch on the bottom of the box.
bulletNever allow students to use the Destruct-o-mizer without supervision.  The lid-down switch and test switch can be intentionally defeated.  Explain why the switches exist, and state the consequences of misuse.
bulletIn a box without a fan, soot will accumulate on the clear cover right above the test clips.  If you don't use a fan, clean this area frequently for better viewing.  The fan version works better because soot particles distribute more evenly in the box.  Occasional cleaning is still needed, however.
bulletI put the current limiter too close to the side wall, which is blackening due to heat.  Put yours a bit farther out.
bulletIf you don't have a printer box and just build a box, don't use glass for a cover.  Students will lean on the cover, and it can break.
bulletI have tried objects other than 1/4 watt resistors, but never in front of students without pretesting.  Some larger resistors can put off large quantities of smoke and soot.  Wieners are amusing to watch - they actually cook.