"Dave Balderstone" wrote in message
news:030720061750384512%dave@N_O_T_T_H_I_Sbalderst one.ca...

I wouldn't want to use a 4" bit in a hand held drill if I wanted a
precise hole.

Agreed


I'd use a saw to rough out the hole, then a router with a guide bushing
and template.

I'd use the router for the whole job. Save making the template.