Share 'Convection Oven and/or Coffee Roaster modifications/techniques'

I am looking to be able to roast 35 to 50kg and, depending a bit on machinery I find, will decide between convection or drum roaster route.  The merits of these have been discussed before here but wanted to ask those with experience here for some basic insights.   Converting Coffee Roaster -- anything being done to modify with regard to interior of drum or speed in order to improve roasting/minim…