Converting Old Propane Grill to Charcoal

The grates, burners and flame tamer bars need to be replaced on my six year old Char Broil grill, but I think the money would be better spent towards a new propane grill. The body of the grill is still in good shape and cleans up nice, so I'm wondering if I can use it as a charcoal grill.  If so, what's involved in the conversion?  Do the grates need to be of a specific material for charcoal?  Can the grill bottom withstand the heat of the charcoal?  Would there be any easy way to clean up the ashes?  Thanks in advance!