Rangerboy
This would be a big project.
The add on armour is designed to stop or minimise RPG rounds. Same principle as the wire mesh Schurtzen the Germans used against Bazooka rounds in WW2.
The M113 is Aluminium, and an RPG would make one really big mess. There wouldn't be a lot left, so you would be showing a whole lot of charred and buckled hull with little else.
A simpler project would be a vehicle that has lost road wheels from a mine blast or deflected RPG round, or some such. Still lots of opportunity to show engine hatch open, etc.
Here is a pic of an Aussie M113 hit by recoiless rounds in Nam which might help
www.vvaa.org.au/images/ m113-wrk.gif