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-Roasts 2/3 cup green beans (could sneak more in)= apx 1/4 lb roasted. Great batch size-fits Sweet Maria's 1/4 lb valve bags. I give these away and have gotten a few people hooked I can sell to, and am building a roaster for my wife's friend who swore Folgers was just as good. She gets it now.
-I can roast anywhere from 3 min to first crack (5 to 2nd), up to as long as I want-I usually finish just into 2nd crack at about 10-11 minutes.
-Binary heat control (off/on) time on then off determines roast curve-ie 5 sec on, 1 sec off, 5 on, etc.= 1st crack at about 9-10 min. 25 sec on, 1 sec off, etc. is about 4-5 min 1st crack. changing this time and adjusting fan allows decent temp control.
-I've gotten readings of 500 deg at 2nd crack, but usually hit it around 450 for most beans.
-in unit cooling= no inclement weather, ambient temp is constant.
-venting means very little smoke in the house, however, I DID NOT seal the cracks in the chimney, so I DO get little smoke-this is desireable b/c it helps determine where I am in the roast, it leaves the house smelling great, and it's not enough to stain, burn your eyes, or set off the smoke alarm.
-Chaff collection system nearly eleminates mess.
-Unit comes apart and stacks neatly in a rubbermaid bin for storage and transport.
COST: $15 to buy my wife's friend a new popper (with the hole in the bottom center) so I could have hers.
$5 thermometer from sweet marias.
$4 elbow
$10 dimmer switch
$10 transformer
A few pounds of coffee to trade for my second popper, different friend.
I had everything else lying around the house. That was the fun of it. I tried to design it so I didn't have to buy anything.
TOOLS
snips, screwdriver, 2x4 to bend the metal, pliers, drill, candle, glass cutter,wire strippers, part of my dog-chewed extension cord, tape measure.

I'd be happy to finish my case and add a glass roasting chamber if it will help the aesthetics and help me win!