Hi u6, and welcome here.
If you have, or have access to a drill press this works pretty slick....you'll need a piece of wood attached to drill press table, drill the holes from the front about one half inch deep (as suggested, a brad point works best) when they all are drilled, take your body off and drill an one eighth inch hole into the wood you put on the table and insert a one eighth inch dowel.
You then flip the body over and put the dowel into each of the holes you drilled to line up the rear holes.
I got this from another forum so I can't take credit.(Thanks, Ron Kirn)
Hope this helps. Good luck
Steve