Fitting keels

[eillew]

Hi, I have recently bought a 16ft fibreglass Yorkshire coble type boat and the wooden keels have some rot/splitting on them. The keels (3 in total) are about 3 inches deep by about inch and a half wide and have corresponding inner keels running along inside the hull. There are bolt heads visible on the tops of the inner keels.

The woodwork inside and out looks to be pretty rotten. Would I be right in assuming that the inner and outer timbers are simply bolted together straight through the hull prior to the steel keelstraps being screwed in place?

Don't know much about boat construction but would be interested to know what kind of job I'm looking at here and what type of wood to use.

Many thanks, Colin