Emergency Cutter Design?

Anyone know if there are any designs/blueprints/whatever for the emergency cutters? Are they just smaller versions of the regular lifeboats or do they differ quite a bit?
No, they are not. The 16 lifeboats are longboats all in wood, but the cutters are like dinghy or Berthon's (Cf: wikipedia Edward Lyon Berthon). But also you could go here, there is some plans you could see : 25 ft lifeboat Cutter - National Maritime Museum

I think that cutters are not made of wood only, if I am right, but could be wrong though...

Hope to have help! Have a nice day.